0_0_9137358_7016.cpp: In function `int main()':
0_0_9137358_7016.cpp:10: error: `step' does not name a type
0_0_9137358_7016.cpp:16: error: `step' undeclared (first use this function)
0_0_9137358_7016.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
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