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Generally, when a language drops below 20,000 speakers it is not a promising sign. We prefer four measures of literacy by language. A challenge occurs when there is no digital dictionary available for a language. For people who cannot read because they are blind or illiterate we'd like to use text to speech software to say the warning.   
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Gabon   Mozambique   Iran  
Population 1,576,665 Population 22,948,858 Population 77,891,220
Literacy 63.2% Literacy 47.8% Literacy 77.1%
French 1,150,491 Portuguese 10,406,372 Southern Azerbaijani 27,202,481
Punu 123,009 Makhuwa 2,328,443 Western Farsi 22.362,228
Fang 61,504 Ndau 1,828,383 Gilaki 3,269,721
Myene 46,743 Tsonga 1,568,417 Mazanderani 3,159,076
Mbere 45,513 Lomwe 1,262,503 Central Kurdish 3,060,972
Sira 39,449 Sena 878,551 Southern Kurdish 3,013,590
Kota 37,501 Chopi 819,636 Qashqa`i 1,599,672
Njebi 34,442 Chuwabu 788,263 Northern Luri 1,596,486
Sangu 25,016 Tswa 705,212 Domari 1,338,616
Lumbu 20,911 Ronga 645,533 Arabic - Mesopotamian 1,231,492
Mozambique has another 32 languages, including four separate dialects of Makhuwa. 16 more languages not shown have over 100,000 speakers each. Iran has at least another 36 languages. That means a lot of network connections and cores to send warnings.