The Split

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How to Build the Trick:
Here is a tutorial by Hevesh5

How to Start the Trick:
Have a standard domino line knock down the first starting domino

How to End the Trick:
Have one of the triangles knock down a domino line

Examples:
Wdomino uses this trick in his 100 Domino Tricks / Techniques

Trivia:
It is also known as "Bermuda Triangles"