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pe(w)+pe(b)+pe(r)=1
3/10+2/5+pe(r)=1
7/10+pe(r)=1
pe(r)=1-7/10
pe(r)=3/10
3/10+2/5+pe(r)=1
7/10+pe(r)=1
pe(r)=1-7/10
pe(r)=3/10
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