問

[justmyself (hsin)]

(ix)    "build bdd <gateName | -all>"

這個指令
是蛇摸情形才會是成功壓

If the <gateName> does not exist in the circuit,
                                issue an error.
If the BDD of the gate or the circuit has been built,
                                issue a warning and do nothing.

已經存在的gateName不就已經是被建好的嗎？
可以舉個例子是沒有被建好而需要我們建的情形嗎？

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