<About rating>
It's almost same rule with common rating of movie.
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Rated G:     All ages admitted
Rated PG:    Until naked in SFW area
Rated PG-13: Until just lewd situation in SFW area
Rated R:     No cuitus but other lewd situations
Rated NC-17: You can order anything you want which things I can draw



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Rated G:@@  SN@
Rated PG:@ @OK@R18NG
Rated PG-13:@OrAGx\܂OK
Rated R:@@@\OK@{ԍsׂ̖mȕ`ʂNG
Rated NC-17:@D݂ZpIɕ`ełΉłOK