compiler: invalid ID name 'BEGIN' in line 1
compiler: invalid ID name 'WRITESP' in line 3
compiler: undeclared variable 'y' in line 5
compiler: undeclared variable 'x' in line 6
compiler: undeclared variable 'y' in line 6
compiler: undeclared variable 'y' in line 7
compiler: undeclared variable 'x' in line 9