The perimeter of a triangle

Given the coordinates of 3 points , you are asked to calculate the perimeter of the triangle formed by those points. The perimeter is the sum of all the sides of the triangle.
The 3 lines of the input contain 3 coordinates - each x and y component on a single line.
The program should output a single line - the perimeter of the triangle formed by those coordinates.
Input
0 0
1 0
0 1

Output
3.41421356237
Tip
You can define a function to compute the distance between two coordinates.
 
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