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The complex interactions of two and three spark-generated bubbles are studied using high speed photography.The corresponding simulations are performed using a 3D Boundary Element Method (BEM) code.The bubbles generated are between 3 to 5 mm in radius, and they are either in-phase (generated and collapsed at the same time) or out-of-phase with one another.The possible interaction phenomena between two identically sized bubbles are summarized.Depending on their relative distances and phase differences, they can coalesce, jet towards or away from one another, split into smaller bubbles, or catapult away from one another.The catapult effect can be utilized to generated high speed jet in the absence of a solid boundary or shockwave.