tweedledum

Just then flew down a monstrous crow,
As black as a tar-barrel;
Which frightened both the heroes so,
They quite forgot their quarrel.'

`I know what you're thinking about,' said Tweedledum: `but it isn't so, nohow.'

`Contrariwise,' continued Tweedledee, `if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic.'

`I was thinking,' Alice said very politely, `which is the best way out of this wood: it's getting so dark. Would you tell me, please?'