The following Python program generates Motzkin trees. They are made of leaves, unary nodes (nodes with one branch) and binary nodes (nodes with two branches).# Motzkin tree of size ndef mot (n) : if n==0 : yield ‘leaf’ else : for m in mot(n-1) : yield (‘unary’,m) for k in range(0,n-1) : for l in mot(k) : for r in mot(n-2-k) :
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