sets have stopped working for thieve

Your AIML does not make sense.

<pattern><set>breakable</set> is breakable</pattern>

You cannot use the set in the pattern if you want to add something to the set. Use * instead.

<pattern>* is breakable</pattern>

the was bad mistake on my part.

I made thieve say in response to I drop the plate.

why did you break the plate?