040000 tree 130b734dae370340ec142153d919a5491f27bcd6	pair.astuple
040000 tree 323ad800177f252d5a3f470f81c007c8403fa0f2	pair.piecewise
040000 tree 3b6b0e6627e5b8492f5920ca783ef97de29b12b6	pairs.general
040000 tree 71076a18082cadc8d752e9b94e89ab77f6d54168	pairs.pair
040000 tree 2d9468cbad0e5563e7f04c4ebdb2c099c915f302	pairs.spec