Technically, L1 & L2 are line segments, and L3 & L4 are polylines.
Extract leading non-zero digit
Project Euler: Problem 5, Smallest multiple
Say something funny
Is the paranthesis sequence balanced ?
Compute Fibonacci Number
The 17x17 Problem
Cell Counting: How Many Draws?
MatCAT - Reconstruct X from Its X-rays
Twins in a Window
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