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\isacommand{lemma}\ {\isachardoublequote}n{\isacharasterisk}n\ {\isacharequal}\ n\ {\isasymLongrightarrow}\ n{\isacharequal}\isadigit{0}\ {\isasymor}\ n{\isacharequal}\isadigit{1}{\isachardoublequote}\isanewline
\end{isabellebody}%
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