Ive read alot of interesting articles on googles indexing standards

but if you submit a site map, and lets say, of a 100 urls, 4 get indexed, is this google narrowing it down to common urls etc ?

E.g. do i have to go through and make my urls more unique ?

this all seemed to happen arround the time of url writes, should i worry any way ? e.g. this is just their site map indexing standard ? but search engines will show up with the separate content based on other things ?

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