040000 tree 75a64ebbd74047bcf0fc5a204a106a5ce35ff82c	combine
040000 tree e67ddf882bbd74a5efb0ed95b26ed86d87095890	filter
040000 tree 15e226060d9b439ec63146707d2e477cc2d99f5c	join
040000 tree f2d2c9d12f21961490ece6b66d1e700b019b7e8d	max
040000 tree dc81b2935638f85b6ee2142190f311a7b61221cc	tornadoes