[TF] turning off echo

[v1g1l at barrysworld.c. (Vigil)]

This is sick but you could hook your input and use it to define a one-shot
trigger that would gag the predicted output.

Azrael had the audacity to claim:

>Here is some output from my world:
>
>"test
>You say, "test"
>/kecho
>% kecho=off
>"test
>You say, "test"
>
>
>As you can see, my input is being echoed before and after the /kecho
>command.
>Any other ideas?

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