Etymology
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Purana 

ancient poetic Sanskrit writings of a legendary character, 1690s, from Sanskrit puranah, literally "ancient, former," from pura "formerly, before" (from PIE *pre-, from root *per- (1) "forward," hence "before"). Related: Puranic.

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com- 
Origin and meaning of com-

word-forming element usually meaning "with, together," from Latin com, archaic form of classical Latin cum "together, together with, in combination," from PIE *kom- "beside, near, by, with" (compare Old English ge-, German ge-). The prefix in Latin sometimes was used as an intensive.

Before vowels and aspirates, it is reduced to co-; before -g-, it is assimilated to cog- or con-; before -l-, assimilated to col-; before -r-, assimilated to cor-; before -c-, -d-, -j-, -n-, -q-, -s-, -t-, and -v-, it is assimilated to con-, which was so frequent that it often was used as the normal form.

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pre- 

word-forming element meaning "before," from Old French pre- and Medieval Latin pre-, both from Latin prae (adverb and preposition) "before in time or place," from PIE *peri- (source also of Oscan prai, Umbrian pre, Sanskrit pare "thereupon," Greek parai "at," Gaulish are- "at, before," Lithuanian prie "at," Old Church Slavonic pri "at," Gothic faura, Old English fore "before"), extended form of root *per- (1) "forward," hence "beyond, in front of, before."

The Latin word was active in forming verbs. Also see prae-. Sometimes in Middle English muddled with words in pro- or per-.

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sug- 
assimilated form of sub- before -g-.
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sy- 
form of syn- before -s- or -z-.
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vor 
German, "before, in front of" (see fore).
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preview (v.)

c. 1600, "to see beforehand," from pre- "before" + view (v.). Marked "rare" in Century Dictionary (1895). The meaning "to show (a film, etc.) before its public opening" is from 1928. Related: Previewed; previewing.

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ante- 
word-forming element meaning "before, in front of; previous, existing beforehand; introductory to," from Latin ante (prep., adv.) "before (in place or time), in front of, against," also used in compounds, from PIE *anti- "facing opposite, against," inflected form (locative singular) of root *ant- "front, forehead," with derivatives meaning "in front of, before."
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sup- 
assimilated form of sub- before -p-.
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as- 
assimilated form of ad- before -s-.
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