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Examples:

f(0, 0):= 0, f(x+1, 0):= 1+ f(x, 0),f(x,y+1):= 1+ f(x,y).

f(0, 0):= 0, f(x+1, 0):= 1+ f(x, 0),f(0,y+1):= 1+ f(0,y),f(x+1,y+1):= 2+ f(x,y),

*All possible base cases must be covered!*

Author: Wolfgang Schreiner

Last Modification: November 24, 1999