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040000 tree 52dd21210ffd5dd01a1a5308865fdd75e513db40	selector
040000 tree 82ba993999aee3050232ee17f6e27b5dbff51695	transformer
040000 tree 586872abd742f3d4d960ee1eef38455032bccec8	traverser
040000 tree 962cf083525d8936800b40b2be0fc6a3d207030c	version
040000 tree d589be0edcd22c8619ae7b8cf5970d4ae7a308d9	visitor