[plt-scheme] Problems multiple snip images.

We are trying to move two snip images at the same time
via keyboards input.We've overrided on-char so that
left and right move the first image(snip-image) and q
and d the other one.The problem is that we can't move
the two images at the same time.Do we need two
event-paces?
could anyone send us some advice please?

 

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