| These selection modes must be known by computer programmers:...Looping Through Multiple Lists
 
 ...descends through lists combining all elements into one ... dim=c(3,4,2); elements of x recycle if x is not long enough...
 
 Google: "combining multiple lists Long, short, cross" yields Lacing type (short, long, cross), in programming.
 
 Then Lacing becomes how to tie shoes...:-)
 
 - Brian
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