D′ ← |1 ⨬(
  ⊸(=₁⧻)°/×
  ⨬(+∩×⊃⋅⊙∘∘◡∩D′⊙/×°⊂|⋅1)
| ⋅1
)⊸<₂
D ← ⨬D′⍜¯D′⊸<₀
≡D-99⇡200
÷7≡D˜ⁿ10+1⇡6