All,

I am sorry for not having included Don's message in my most recent
post in this thread. It must have been confusing.

To continue that discussion where I mentioned using M. ,
here are some experiments I performed. Do they suggest that M. is
actually reducing the time requirement? I am not sure.

     ts =: 6!:2 , 7!:2...@]
        F=: I. - ] < I. { [,_:
        FM =: I. M. - ] < I. { [,_:
        FMM =: I. M. - ] < I. M. { [,_:
        FMMN =: I. - ] < I. M. { [,_:
     test =: ?.100000#8
     ts '2 3 5 F test'
0.10805 1.70515e6
     ts '2 3 5 FM test'
0.066664 1.70515e6
     ts '2 3 5 FMM test'
0.0505471 1.70515e6
     ts '2 3 5 FMMN test'
0.0625262 1.70515e6
     ts '2 3 5 F test'
0.0843358 1.70515e6
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