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正确的 CSP 语法如何? (problem.addConstraint)

如何解决正确的 CSP 语法如何? (problem.addConstraint)

from constraint import *
problem = Problem()
problem.addVariables(["a","b","c","d","e","f"],[1,2,3,4,5,6])
problem.addConstraint(AllDifferentConstraint())

约束是:

"a" = 1 ; "b" = 2 ; "c" = 3 或

"a" = 1 ; "b" = 3 ; "c" = 2 或

"a" = 2 ; "b" = 1 ; "c" = 3 或

"a" = 2 ; "b" = 3 ; "c" = 1 或

"a" = 3 ; "b" = 1 ; "c" = 2 或

"a" = 3 ; "b" = 2 ; "c" = 1

正确的语法必须如何?

problem.addConstraint(lambda a,b,c:    ?? permutation ??,(1,3))

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