Tybed a all rhywun daflu goleuni ar yr erthyl 'Datganiad Pragmatig' sydd wedi ymdreiddio i mewn i eirfeydd Hanes fel pwnc? A yw wedi cael ei ddefnyddio erioed? O ble y daeth? Pe bai disgybl neu fyfyriwr yn gofyn am ddiffiniad o'r ddau air, beth ddylai rhywun ei ddweud?
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