Problems worthy
    of attack
prove their worth
    by hitting back.
        ---Piet Hein

"Problems," Grooks, Borgens Forlag, Copenhagen, Denmark, The MIT Press, Cambridge, MA, 1966; Grooks 1, Doubleday & Company Inc., Garden City, NY, General Publishing Company Limited, Toronto, 1969; Collected Grooks I, Borgens Forlag, Copenhagen, Denmark, 2002

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