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for((112,97,99,107)){$s.=chr $_}; ($z="``'=``:=`~,=``~=``{=;'=``'=+}=++=`~}=;". ... "=::=,'=,:=::=,{=:_=::=,'=,:=::=,,=,~=::=,'=,". ":=::=:+=:_=:`=,+=`~")=~tr/~`';:,{}_+=/0-9i/; eval "\$_=$s 'c*', qw/@{[split /i/,$z]}/;";eval;
my $a='62696c6c77667269656e6440676d61696c2e636f6d'; while ($a=~m/(^.{2})/s) {print unpack('A',pack('H*',"$1"));$a=~s/^.{2}//s;}