Given a binary matrix your task is to complete the function **printMat **which prints all unique rows of the given matrix. The function takes three arguments the first argument is a matrix M and the next two arguments are row and col denoting the rows and columns of the matrix.

**Input:**

The first line of input is an integer T denoting the no of test cases.Then T test cases follow. Each test case consists of 2 lines . The first line of each test case is are two integers row and col denoting the no of rows and columns of matrix . Then in the next line are row*col space separated values of the matrix M.

**Output:**

The output will be the unique rows of the matrix separated by space .

**Note : **Dont print new line after each row instead print "$" without quotes .

**Constraints:**

1<=T<=20

1<=row,col<=40

0<=M[ ][ ]<=1

**Example:**

**Input**

1

3 4

1 1 0 1 1 0 0 1 1 1 0 1

**Output**

1 1 0 1 $1 0 0 1 $

**Explanation**

Above the matrix of size 3x4 looks like

1 1 0 1

1 0 0 1

1 1 0 1

The two unique rows are 1 1 0 1 and 1 0 0 1 .

**Note:**The **Input/Ouput** format and **Example** given are used for system's internal purpose, and should be used by a user for **Expected Output** only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.

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