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Mathematics 7 Online
OpenStudy (unklerhaukus):

\[\begin{align}\,2\\ 10\\ 12\\ 21\\ ???\end{align}\]

OpenStudy (anonymous):

102, 111, 201, 212, 1002, 1011, 1112, 1121, 1202, 1222, 2012, 2021,...

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