Description

Given $n(1\le n\le20)$, output the first $n$ rows of Pascal's triangle.

If you do not know what Pascal's triangle is, you can observe the sample and look for the pattern.

6

1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1

Hint

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