Rows similar to the first one

You are given an $m \times n$ matrix with elements from $0$ to $100$. Two rows are similar if they consist of the same set of numbers: repetitions and order do not matter, only which numbers occur. For example, 1 2 2 and 2 1 1 are similar (both are $\{1, 2\}$).

Find the number of rows similar to the first one (the first row itself does not count).

The first line contains $m$ and $n$ ($1 \le m, n \le 100$). The next $m$ lines contain $n$ integers each ().

A single integer — the number of similar rows.

Turn every row into a set and compare it with the set of the first row. In the first example row 2 is similar, while row 3 has an extra $3$ — the answer is $1$.