one, 1, two, 2, three , 3, four, 4, five, 5, six, 6, seven, 7, eight , 8, nine, 9, ten, 10, eleven, 11, twelve , 12, thirteen , 13, fourteen , 14, fifteen , 15, sixteen, 16, seventeen , 17, eighteen , 18, nineteen , 19, twenty, 20.

numbers beginner level

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