This file is indexed.

/usr/share/X11/locale/pt_BR.UTF-8/Compose is in libx11-data 2:1.6.3-1ubuntu2.

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The actual contents of the file can be viewed below.

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# UTF-8 (Unicode) compose sequences
#
# Originally modified for Brazilian Portuguese
#   by Gustavo Noronha Silva <kov@debian.org>.
# Transformed to an include file plus some overrides
#   by Benno Schulenberg <bensberg@justemail.net>

# Use the sequences from en_US.UTF-8 as the basis:
include "/usr/share/X11/locale/en_US.UTF-8/Compose"

# This one should probably be deleted, because in
# en_US.UTF8 this is lowercase schwa, not uppercase:
<Multi_key> <e> <e> 			: "Ə" U018f

# Two nice additions -- maybe add to en_US.UTF8?
<Multi_key> <quotedbl> <backslash> 	: "〝" U301d	# REVERSED DOUBLE PRIME QUOTATION MARK
<Multi_key> <quotedbl> <slash>  	: "〞" U301e	# DOUBLE PRIME QUOTATION MARK

#  Overriding C with acute:
<dead_acute> <C> 			: "Ç" Ccedilla	# LATIN CAPITAL LETTER C WITH CEDILLA
<dead_acute> <c> 			: "ç" ccedilla	# LATIN SMALL LETTER C WITH CEDILLA

#  Overriding E with ogonek:
<Multi_key> <comma> <E> 		: "Ȩ" U0228	# LATIN CAPITAL LETTER E WITH CEDILLA
<Multi_key> <comma> <e> 		: "ȩ" U0229	# LATIN SMALL LETTER E WITH CEDILLA

#  Overriding U with ogonek:
<Multi_key> <U> <comma> <E> 		: "Ḝ" U1E1C	# LATIN CAPITAL LETTER E WITH CEDILLA AND BREVE
<Multi_key> <U> <comma> <e> 		: "ḝ" U1E1D	# LATIN SMALL LETTER E WITH CEDILLA AND BREVE

# These two should probably go back into en_US.UTF8;
# they were most likely mistakenly dropped in June 2006:
<Multi_key> <acute> <U03D2> 		: "ϓ" U03D3	# GREEK UPSILON WITH ACUTE AND HOOK SYMBOL
<Multi_key> <apostrophe> <U03D2> 	: "ϓ" U03D3	# GREEK UPSILON WITH ACUTE AND HOOK SYMBOL