3512：Incidental Points

Unlike a straight line, a straight segment between two points P₁, P₂ (normally written as P₁P₂) is a line that links the two points but doesn’t extend beyond them. A third point P₃ is said to be incident to P₁P₂ iff P₃ lies on the straight line and between the points P₁ and P₂. P₁P₂ is said to include P₃. By definition, P₁ and P₂ are included in P₁P₂. Write a program to find the segment that includes the most number of given points.

Your program will be tested on one or more test cases. Each test case includes a set of two or more unique points, where the Cartesian coordinates of each point is specified on a separate line using two integers X and Y where 0 ≤ |X|, |Y| < 1,000,000. No test case has more than 1000 points. An input line made of two or more '-' (minus signs) signals the end of a test case. An extra input line of two or more '-' (minus signs) follow the last test case.

For each test case, output the result on a single line using the following format:

k. n

Where k is the test case number (starting at 1), and n is the number of points on the segment.