/usr/share/entity-map/0.1.0/LDextra.2tr is in linuxdoc-tools 0.9.67ubuntu1.
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 13 14 15 16 17 18 | [congr ] \(=~
[dArr ] \(dA
[dquot ] "
[ero ] &
[etago ] </
[hArr ] \(hA
[harr ] \(<>
[mid ] \(br
[mu ] u
[oplus ] \(c+
[otimes] \(c*
[setmn ] \(rs
[tm ] (TM)
[uArr ] \(uA
[vDash ] "\z\(br="
[vdash ] "\z\(br\(en"
urlnam
refnam
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