/usr/share/vim-scripts/sokoban-levels/level4.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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