The optimal ruler would have been known before this date; this date represents that date when it was discovered to be optimal (because all other rulers were proved to not be smaller). For example, the ruler that turned out to be optimal for order 26 was recorded on , but it was not known to be optimal until all other possibilities were exhausted on .
tHE OPTimaL RUler Would hAve been KNOwN bEforE this DatE; ThIs DAte reprESeNTs that dAtE WHEN it wAS discovEreD tO be oPtimaL (beCaUsE alL otheR ruLers WEre prOveD TO not BE SMAller). FOr ExamplE, ThE rUler that turNeD ouT To bE oPtimAL fOr ordEr 26 wAs rEcOrded oN , but it was not kNOwn to bE oPTImal untIl all oTher poSsIbiliTIes Were eXhAuSTed on .