7.ss, scheme.1.in, comments of many files original commit: 06f858f9a505b9d6fb6ca1ac97234927cb2dc641
record-equal-procedure, and record-hash-procedure original commit: 1e0fc38fe4df25804532baef87eaf30340e30bed
original commit: 47a210c15c63ba9677852269447bd2f2598b51fe