求助ai语句中nand是什么意思
(defrule(difficulty == moderate)
(game-time > 300)
(building-type-count wonder < 1)
(soldier-count == 0)
(unit-type-count villager < five-percent-pop)
(nand
(players-stance any-human ally)
(stance-toward any-human ally)
)
(not (can-train villager) )
=>
(set-goal 1 19)
(disable-self)
)
nand就是与非，下面两个都成立的时候是假，否则为真
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