The summation symbol

\sum\limits_{n=1}^1 1=1

\sum\limits_{n=1}^2 1=1+1

\sum\limits_{n=1}^3 1=1+1+1

\sum\limits_{n=1}^4 1=1+1+1+1

\sum\limits_{n=1}^5 1=1+1+1+1+1

\sum\limits_{n=1}^6 1=1+1+1+1+1+1

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