View Compilation Error

0_0_16721753_31534.pas(55,10) Error: Identifier not found "t"
0_0_16721753_31534.pas(56,10) Error: Identifier not found "t"
0_0_16721753_31534.pas(58,8) Error: Identifier not found "t"
0_0_16721753_31534.pas(65,20) Error: Identifier not found "gcd"
0_0_16721753_31534.pas(68,20) Error: Identifier not found "gcd"
0_0_16721753_31534.pas(71,4) Fatal: There were 5 errors compiling module, stopping
Fatal: Compilation aborted
Error: Pascel\bin\i386-win32\ppc386.exe returned an error exitcode (normal if you did not specify a source file to be compiled)