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0_0_17702603_17785.cpp:31:2: error: stray '#' in program
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  ^
0_0_17702603_17785.cpp:31:3: error: expected unqualified-id before numeric constant
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   ^
0_0_17702603_17785.cpp:31:3: error: expected constructor, destructor, or type conversion before numeric constant
0_0_17702603_17785.cpp:31:8: error: 'Back' does not name a type
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        ^