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(define-module (sat helpers)
#:use-module (sat solver)
#:use-module (srfi srfi-1)
#:export (exactly-one-true))
(define (exactly-one-true v)
;; At least one of 'v' must be true
(add-clause v)
;; At least one of each pair in 'v' must be false
(pair-for-each
(lambda (v1p)
(for-each
(lambda (v2)
(add-clause (list (- (car v1p)) (- v2))))
(cdr v1p)))
v))
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