View Compilation Error

0_0_15841723_25013.pas(7,17) Error: Identifier not found "a"
0_0_15841723_25013.pas(7,19) Error: Identifier not found "b"
0_0_15841723_25013.pas(7,28) Error: Identifier not found "b"
0_0_15841723_25013.pas(9,4) Fatal: There were 3 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)