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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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I understand what you write, but why would replace work 50x faster? I was told that generators are pretty fast usually. Could you redirect me to some info about it?
yes
Palindrom would be read same from both sides... but we tak about ONE world, not two different. Those different's are reversals, like said in description.
My English is bad, so here is better explanation:
202 is palindrom.
102 is not.
201 is not.
201 and 102 are reversals to each other.
202 and 202 are ALSO reversals to each others.
(That the reason for excluding palindroms - each palindrom have same prime factor like reversal, because it's, by definition, same number).