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Ising (σ\sigma) anyons have fusion rules: vacuum×σ=σ\text{vacuum} \times \sigma = \sigma, σ×σ=vacuum+ψ\sigma \times \sigma = \text{vacuum} + \psi, and ψ×σ=σ\psi \times \sigma = \sigma. Fuse 6 σ\sigma anyons one at a time from left to right (start: a single σ\sigma, then bring in 5 more). How many distinct fusion trees end with total charge = vacuum?