040000 tree ffb4a7a2d9e093971b56de70c49bbaf8cf578cdd	pair.astuple
040000 tree 533a6fe992366745938251662eaf0b1c7ffb7b5e	pair.piecewise
040000 tree 3b6b0e6627e5b8492f5920ca783ef97de29b12b6	pairs.general
040000 tree 1ad2745836d204dbfeab61df9e12e9f14e91b051	pairs.pair
040000 tree b7146b4b19436820d12bb8fd3f5ec0ea9a528fd3	pairs.spec