040000 tree ffb4a7a2d9e093971b56de70c49bbaf8cf578cdd	pair.astuple
040000 tree a39d5a6598277d9ec72c0251713954fdd37bb292	pair.piecewise
040000 tree 3b6b0e6627e5b8492f5920ca783ef97de29b12b6	pairs.general
040000 tree c619d6abfdd7d9f98c3921b2c721ce8f58837a57	pairs.pair
040000 tree b7146b4b19436820d12bb8fd3f5ec0ea9a528fd3	pairs.spec