Mark Rain. Machine-oriented language, a supeset of ALGOL68, extensible. Hidden on the back cover of the manual: MARY HAD A LITTLE LAMB - COERCION IMPOSSIBLE. "Mary Programmer's Reference Manual", M. Rain et al, R Unit, Trondheim Norway, 1974. "Operator Expressions in Mary", M. Rain, SIGPLAN Notices 8(1) (Jan 1973).