problem in Gasp !

[n.a.s]

Hi,

I want to ask about graphics using Gasp .Attached is exercise 10 (houses at
night) <http://openbookproject.net/thinkCSpy/ch04.html#exercises> ,if  i
call the draw_house function once it will work properly ,but more than one
call,windows and doors disappear from some houses .

Any one can advice?


Thanks,
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