very necessary rubber stamp

actual appropriate authentic bare basic binding cardinal chief compelling compulsory concept correct crucial decisive elementary especial exceedingly exigent expedient express fundamental genuine greatly grunge grungy highly ideal identical imperative indispensable indubitable ink mandatory mere miscellaneous model momentous most much necessary needed needful obligatory paramount perfect plain precise prerequisite pressing prime principal pure rectangular red required requisite right rubber same selfsame sheer sign significant simple special stamp sureenough symbol true unavoidable undoubted unqualified unquestionable urgent veritable very vital