/usr/share/X11/locale/cs_CZ.UTF-8/Compose is in libx11-data 2:1.6.3-1ubuntu2.
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1 2 3 4 5 6 7 8 9 10 11 12 | # UTF-8 (Unicode) compose sequences
#
# Modified for Czech, following iso8859-2/Compose
# by James Cloos <cloos@jhcloos.com>
# based on bug report by Vladimír Marek <vlmarek@volny.cz>
# Use the sequences from en_US.UTF-8 as the basis:
include "/usr/share/X11/locale/en_US.UTF-8/Compose"
# Overriding U with caron:
<dead_caron> <u> : "ů" U016F # LATIN SMALL LETTER U WITH RING ABOVE
<dead_caron> <U> : "Ů" U016E # LATIN CAPITAL LETTER U WITH RING ABOVE
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