Last tweaked by Mike Spreitzer on September 21, 1987 1:09:11 pm PDT

IMPORTS Collections, Convert, IntFunctions, IO, LichenDataOps, LichenDataStructure, LichenNavigation, List, PairCollections, Rope, RuntimeError, StructuredStreams, UnparserBuffer

CONTROL LichenStructuringImpl, LichenData5Impl