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code_segments/segment_213.txt

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+You have $n$ rectangles, the $i$-th of which has a width of $a_i$ and a height of $b_i$.
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+You can perform the following operation an unlimited number of times: choose a rectangle and a cell in it, and then color it.
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+Each time you completely color any row or column, you earn $1$ point. Your task is to score at least $k$ points with as few operations as possible.
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+Suppose you have a rectangle with a width of $6$ and a height of $3$. You can score $4$ points by coloring all the cells in any $4$ columns, thus performing $12$ operations.
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+The first line contains an integer $t$ ($1 \le t \le 100$) — the number of test cases. The following are the descriptions of the test cases.
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+The first line of each test case description contains two integers $n$ and $k$ ($1 \le n \le 1000, 1 \le k \le 100$) — the number of rectangles in the case and the required number of points.
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+The next $n$ lines contain the descriptions of the rectangles. The $i$-th line contains two integers $a_i$ and $b_i$ ($1 \le a_i, b_i \le 100$) — the width and height of the $i$-th rectangle.
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+It is guaranteed that the sum of the values of $n$ across all test cases does not exceed $1000$.
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+For each test case, output a single integer — the minimum number of operations required to score at least $k$ points. If it is impossible to score at least $k$ points, output -1.
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