-O2 -Wchar-subscripts -Wcomment -Wformat=2 -Wimplicit-int
-Werror-implicit-function-declaration -Wmain -Wparentheses
-Wsequence-point -Wreturn-type -Wswitch -Wtrigraphs -Wunused
-Wuninitialized -Wunknown-pragmas -Wfloat-equal -Wundef
-Wshadow -Wpointer-arith -Wbad-function-cast -Wwrite-strings
-Wconversion -Wsign-compare -Waggregate-return -Wstrict-prototypes
-Wmissing-prototypes -Wmissing-declarations -Wmissing-noreturn
-Wformat -Wmissing-format-attribute -Wno-deprecated-declarations
-Wpacked -Wredundant-decls -Wnested-externs -Winline -Wlong-long
-Wunreachable-code
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