3 Each of the *.in files is XER-decoded, then converted into PER,
4 then compared with the .out file, then decoded back into XER
5 and compared to the original .in file content.
9 *-C.in - Comparison of .out might fail, but decoding succeeds
10 *-P.in - PER decoding of .out file must fail.
11 *-X.in - Final XER comparison must fail.