ToDec ←  +´×⟜(⌽·(10⊸⋆∘↕ ∘≠⊢)⊢)
Partition ←  (¬-˜⊢×·+`»⊸>)⊸⊔
Solution ←  {a‿b‿c‿d ←  ToDec¨'0'-˜𝕩Partition˜(¬"-,"∊˜⊢)𝕩 ⋄ 0≥(a-b) × (c-d)}