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/usr/share/dpkg/abitable is in dpkg 1.17.27.

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# This file contains the table of arch ABI attribute overrides.
#
# If the ABI is not present here then the attribute information for a
# Debian triplet matches the one on the cputable.
#
# Column 1 is the Debian name for the ABI.
# Column 2 is the size (in bits) of the ABI integers/pointers.
#
# <Debian name>	<Bits>
gnuabin32	32
gnux32		32