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well i was interested in the same question and finally found the answer!!

It's Primary,Secondary,Tertiary,and!! "quaternary"

Oh and your welcome;-)

...and then I found: The sequence continues with quaternary, quinary, senary, septenary, octonary, nonary, denary. Words also exist for `twelfth order' (duodenary) and `twentieth order' (vigenary).

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15y ago

What else can I help you with?