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trimorphic n.  and  zygodrome

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(max 15 digits)

First numbers that belong to both sets:

99, 999, 9999, 99999, 999999, 9999999, 99999999, 999999999, 9999999999, 99999999999, 999999999999, 9999999999999, 99999999999999, 999999999999999.