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How fireworks turn to shapes similar to hearts and stars

Briefly illustrate how do fireworks turn to shapes similar to hearts and stars?

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The fireworks creators encompass worked for many decades to figure such things out. There are many factors. The individual little bursts are wrapped individually. They are then arranged about a core in the shape desired and the propellant charge is positioned in the middle. Whenever it goes off it lights the individual bursts and propels them in the desired shape.

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