E.C. Haines, 1964. An experimental variant of LISP1.5, implemented on the STRETCH computer. Basic structure was a trinary tree. ["The TREET Time-Sharing System", H.A. Bayard et al, Proc 2nd Symp Symb and Alg Manip, ACM (Mar 1971)]. [Sammet 1969, pp.457-461].

In addition suitable contents:
[ 2 ] [ = ] [ ACM ] [ ai ] [ al ] [ am ] [ an ] [ ar ] [ arc ] [ as ] [ B ] [ b ] [ C ] [ ch ] [ CM ] [ co ] [ com ] [ computer ] [ du ] [ E ] [ ed ] [ ee ] [ er ] [ es ] [ ET ] [ et ] [ ETC ] [ fi ] [ file ] [ h ] [ hr ] [ id ] [ il ] [ in ] [ IS ] [ ISP ] [ Lex ] [ LIS ] [ M ] [ mm ] [ mo ] [ mod ] [ module ] [ mp ] [ na ] [ ne ] [ ng ] [ ni ] [ om ] [ pe ] [ ph ] [ pl ] [ query ] [ rc ] [ RE ] [ re ] [ ro ] [ ru ] [ S ] [ se ] [ si ] [ SP ] [ st ] [ struct ] [ T ] [ th ] [ tr ] [ tree ] [ va ] [ var ]