/usr/share/vim-scripts/sokoban-levels/level31.sok is in vim-scripts 20130814.
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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