Crossed Matchings

Time Limit: 2 Seconds
Memory Limit: 65536 KB

There are two rows of positive integer numbers. We can draw one line segment
between any two equal numbers, with values r, if one of them is located in the
first row and the other one is located in the second row. We call this line
segment an r-matching segment. The following figure shows a 3-matching and a
2-matching segment.

We want to find the maximum number of matching segments possible to draw for
the given input, such that:

1. Each a-matching segment should cross exactly one b-matching segment, where
a != b.

2. No two matching segments can be drawn from a number. For example, the following
matchings are not allowed.

Write a program to compute the maximum number of matching segments for the
input data. Note that this number is always even.

**Input**

The first line of the file is the number M, which is the number of test cases
(1 <= M <= 10). Each test case has three lines. The first line contains
N1 and N2, the number of integers on the first and the second row respectively.
The next line contains N1 integers which are the numbers on the first row. The
third line contains N2 integers which are the numbers on the second row. All
numbers are positive integers less than 100.

**Output**

Output file should have one separate line for each test case. The maximum number
of matching segments for each test case should be written in one separate line.

**Sample Input**

3

6 6

1 3 1 3 1 3

3 1 3 1 3 1

4 4

1 1 3 3

1 1 3 3

12 11

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

3 1 2 3 2 4 12 1 5 5 3

**Sample Output**

6

0

8

Source:

**Asia 1999, Tehran (Iran)**
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