This file is indexed.

/usr/share/genometools/gtdata/trans/TransDNAlowermask is in genometools-common 1.5.1-2ubuntu1.

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

The actual contents of the file can be viewed below.

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A
C
G
TU
acgtunsywrkvbdhmxNSYWRKVBDHMX