[Jprogramming] convert 0,1 coding to _1,1

[Brian Schott]

Is there a better way than the verb `am` to do the 
following?

   am =:_1& (I.@:-.@]})
   am"1] 2 6 ?.@$ 2
_1 _1 _1 _1 1 _1
_1 _1 _1  1 1 _1
(B=)


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