040000 tree d72fa6121df810f7b074710a530ae9595fc090af	pair.astuple
040000 tree 323ad800177f252d5a3f470f81c007c8403fa0f2	pair.piecewise
040000 tree 3b6b0e6627e5b8492f5920ca783ef97de29b12b6	pairs.general
040000 tree 0cd24db0a9d4b3402a951db8ff5cd2912feaa24c	pairs.pair
040000 tree 9c578faee5ab56f3ae035ab272a22eacb8c5da23	pairs.spec