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/usr/share/language-tools/main-countries is in accountsservice 0.6.45-1ubuntu1.

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The actual contents of the file can be viewed below.

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# If multiple country codes are present among the available locales for
# a language, we may want to map the language code to the language's
# main or origin country. The list below aims to serve that purpose.
#
aa	aa_ET
ar	ar_EG
bn	bn_BD
ca	ca_ES
de	de_DE
el	el_GR
en	en_US
es	es_ES
eu	eu_ES
fr	fr_FR
fy	fy_NL
it	it_IT
li	li_NL
nl	nl_NL
om	om_ET
pa	pa_PK
pt	pt_PT
ru	ru_RU
so	so_SO
sr	sr_RS
sv	sv_SE
ti	ti_ER
tr	tr_TR