Searching a long time a program error i met this special case: Execute (".) converts strings of defined names to nouns, but string of undefined name results empty vector:
Defined=: 1 2 2 3
   ".'Defined'
1 2 2 3
   Defined
1 2 2 3
   NotDefined
|value error: NotDefined

but why
 ".'NotDefined'
results to a empty list of numbers

 10{.".'NotDefined'
0 0 0 0 0 0 0 0 0 0

why not value error?

Anssi

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