/usr/share/aspell/en.contents is in aspell-en 6.0-0-6ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | en-common
en-variant_0
en-variant_1
en-variant_2
en_CA-w_accents-only
en_CA-wo_accents-only
en_GB-ise-w_accents-only
en_GB-ise-wo_accents-only
en_GB-ize-w_accents-only
en_GB-ize-wo_accents-only
en_US-w_accents-only
en_US-wo_accents-only
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