I think you also need parenthesis, in mathematica they are inplicititally inserted in the notebook W (ctrl--) δ₁ρ₁σ₂ (ctrl-5) 3β {W (ctrl--) δ₁}ρ₁σ₂ (ctrl-5) 3

I think you also need parenthesis, in mathematica they are inplicititally inserted in the notebook W (ctrl--) δ₁ρ₁σ₂ (ctrl-5) 3β {W (ctrl--) δ₁}ρ₁σ₂ (ctrl-5) 3β {W (ctrl--) δ₁ρ₁}σ₂ (ctrl-5) 3β {W (ctrl--) δ₁ρ₁σ₂} (ctrl-5) 3β I believe that such a standard would be extremely non-extensible.