/usr/share/vim-scripts/sokoban-levels/level73.sok is in vim-scripts 20130814ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# # #@ # #
# $$ #$$# # # ## #
# # $ $ #$$ # #
## # # # # # # #
# ## # #
# # $ # # # #
# $ #$ # # $ #..#
##$ # #### #...#
# $ #....#
# # # #.....#
####################
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