one - first, two - second, three - third, four - fourth, five - fifth, six - sixth, seven - seventh, eight - eighth, nine - ninth, ten - tenth, eleven - eleventh, twelve - twelfth, thirteen - thirteenth, fourteen - fourteenth, fifteen - fifteenth, sixteen - sixteenth, eighteen - eighteenth, twenty - twentieth, twenty-seven - twenty- seventh, thirty one - thirty first,

SPO Elementary Unit 6

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