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yap-6.3/packages/cplint/examples/light.cpl

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/*
?- p(light).
yes
?- s([push,replace],P).
P = 0.5 ?
yes
?- s([push,light],P).
P = 0.5 ?
yes
?- s([push,light,replace],P).
P = 0 ?
yes
?- s([light,replace],P).
P = 0 ?
yes
?- s([light],P).
P = 0.5 ?
yes
?- s([replace],P).
P = 0.5 ?
yes
*/
push.
light : 0.5 :- push.
replace :- \+ light.