Balance Mystery

Logic Level 3

You have 4 stones. They are of four distinct colors, and they are also of distinct weights of 1, 2, 3, 4 grams. However, you do not know which weight corresponds to which color. The balance scale you have can only indicate which side is heavier or whether the two sides are balanced, without further details. You may put as many stones as you want on each side of the scale.

What is the least number of weighing trials needed to ensure correct weight labeling for all stones?

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