This file is indexed.

/usr/share/dpkg/tupletable is in dpkg 1.19.0.5ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Version=1.0
#
# Bidirectional mapping between a Debian arch tuple and a Debian arch name.
#
# Supported variables: <cpu>
#
# <Debian arch tuple>		<Debian arch name>
eabi-uclibc-linux-arm		uclibc-linux-armel
base-uclibc-linux-<cpu>		uclibc-linux-<cpu>
eabihf-musl-linux-arm		musl-linux-armhf
base-musl-linux-<cpu>		musl-linux-<cpu>
ilp32-gnu-linux-arm64		arm64ilp32
eabihf-gnu-linux-arm		armhf
eabi-gnu-linux-arm		armel
abin32-gnu-linux-mips64r6el	mipsn32r6el
abin32-gnu-linux-mips64r6	mipsn32r6
abin32-gnu-linux-mips64el	mipsn32el
abin32-gnu-linux-mips64		mipsn32
abi64-gnu-linux-mips64r6el	mips64r6el
abi64-gnu-linux-mips64r6	mips64r6
abi64-gnu-linux-mips64el	mips64el
abi64-gnu-linux-mips64		mips64
spe-gnu-linux-powerpc		powerpcspe
x32-gnu-linux-amd64		x32
base-gnu-linux-<cpu>		<cpu>
eabihf-gnu-kfreebsd-arm		kfreebsd-armhf
base-gnu-kfreebsd-<cpu>		kfreebsd-<cpu>
base-gnu-knetbsd-<cpu>		knetbsd-<cpu>
base-gnu-kopensolaris-<cpu>	kopensolaris-<cpu>
base-gnu-hurd-<cpu>		hurd-<cpu>
base-bsd-dragonflybsd-<cpu>	dragonflybsd-<cpu>
base-bsd-freebsd-<cpu>		freebsd-<cpu>
base-bsd-openbsd-<cpu>		openbsd-<cpu>
base-bsd-netbsd-<cpu>		netbsd-<cpu>
base-bsd-darwin-<cpu>		darwin-<cpu>
base-sysv-aix-<cpu>		aix-<cpu>
base-sysv-solaris-<cpu>		solaris-<cpu>
eabi-uclibc-uclinux-arm		uclinux-armel
base-uclibc-uclinux-<cpu>	uclinux-<cpu>
base-tos-mint-m68k		mint-m68k