[Jbeta] any dyad 15!:13 ?

[bill lam]

callback address by 15!:13 ,especially smaller arguments, is used up easily. For 
example "cdcb 4" already used by dirbrowse.
Other interpretive language such as perl already provide any number of callback 
address.  Even if this is difficult, will it be possible to add an optional left 
argument to 15!:13 so that at least 5 to 10 different addresses for the same 
right argument could be provided?
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