F₁(t) = sin(2π f₁ t + φ₁) + 0.333·sin(6π f₁ t + φ₁/3)
F₂(t) = sin(2π f₂ t + φ₂) − 0.333·sin(4π f₂ t − φ₂/2)
Δ(t) = F₁(t) − F₂(t), markers near Δ ≈ 0
α, β, γ, δ — four harmonics from the same seed
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