/usr/share/vim-scripts/sokoban-levels/level56.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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# $# $ ###
# ## $ ### #....#
# # $# # # # #....##
# $ $ # #....###
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# # $ ######
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