[plt-scheme] Question

=?gb2312?q?=B3=C2=D3=DA=BF=B5?= chenyu_kang at yahoo.com.cn
Tue Jun 17 11:00:10 EDT 2008


hello !

Can anyone can tell me the answer to Exercise 21.1.3
in HTDP.. I can't figure it out.

THANKS.....








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