All spiders with k legs of length 3 and m pendant leaves at the center are graceful for every k ≥ 1 and m ≥ 0.
Fang,A computational approach to the graceful tree conjecture
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Graceful labelings of spiders with three-edge legs and pendant leaves at the center
All spiders with k legs of length 3 and m pendant leaves at the center are graceful for every k ≥ 1 and m ≥ 0.