Mary

Hidden on the back cover of the manual: MARY HAD A LITTLE LAMB - COERCION IMPOSSIBLE.

Mark Rain

An extensible machine-oriented language, a superset of ALGOL 68.

"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).