>> I'll give you a hint: position.

>> a: [1 2 3 4 5]
== [1 2 3 4 5]
>> b: next a
== [2 3 4 5]
>> c: skip b 2
== [4 5]

>> reduce [same? a b        same? b c             same? a c]
== [false false false]
>> reduce [same? a head b   same? head b head c   same? a head c]
== [true true true]
>> reduce [same? at a 2 b   same? at b 3 c        same? tail a tail c]
== [true true true]


http://www.rebolforces.com/articles/series/


-- Gregg                         

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