040000 tree 3f702fdf9a87dfd43905f208fd7d6239611f09da	pair.astuple
040000 tree fc55ca73d9cfb6e4835551177a9d2d577ed5e522	pair.piecewise
040000 tree 3b6b0e6627e5b8492f5920ca783ef97de29b12b6	pairs.general
040000 tree d0c9e698a039e52bb1d32ffa4ad94943a1107c45	pairs.pair
040000 tree f22d90df795495befeb361fd952e37f301d178cb	pairs.spec