Mon, 24 Jan 1994 12:03:53 +0100 wenzelm added is_empty: env -> bool, minidx: env -> int option;
Thu, 20 Jan 1994 13:35:40 +0100 nipkow added HOLCF
Thu, 20 Jan 1994 12:38:02 +0100 nipkow removed square and fact
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