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→# to an index arrays, etc
==# to an index arrays, etc==
==# to an index arrays, etc==
<pre>
(1..10)#0..2
(1..10)#0..2
(1..10)#2
(1..10)#2
a#[["speed","weight"],[["details","size"]]] ;
a#[["speed","weight"],[["details","size"]]] ;
a#[[["details","size"]]] ;
a#[[["details","size"]]] ;
</pre>