science experiment
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6 defs 2 3 defs 3 3 defs 3 3 defs 3 3 defs 7 6 defs 4 5 defs 3 3 defs 1 5 defs 2 3 defs 3 3 defs 4 3 defs 6 6 defs 2 6 defs 4 3 defs 4 3 defs 2 6 defs 8 3 defs 3 7 defs 6 6 defs 1 3 defs 9 3 defs 6 3 defs 2 7 defs 4 3 defs 1 4 defs 3 6 defs 3 3 defs 4 5 defs 1 3 defs 3