working_PSVs = [0, 1, 2, 3, 6, 7, 8, 9, 10, 11, 12, 18, 19, 20, 21, 25, 26, 27, 28]

for TID in range(0, 65536):
    for SID in range(0, 65536):
        TSV = (TID ^ SID) >> 3
        if TSV in working_PSVs:
            count_working += 1