⍝ 1: Let's Split!
 {(0>⍺)⌽(⊂⍺↑⍵),⊂⍺↓⍵}
 ((0>⊣)⌽((⊂↑),(⊂↓)))
 ⍝ 2: Character Building
 {(~⍵∊127+⍳64)⊂⍵}
 ⍝ 3: Excel-lent Columns
 (26⊥64-⍨⎕UCS)
 ⍝ 4: Take a Leap
 (1 3∊⍨(0+.=400 100 4∘.|⊢))
 ⍝ 5: Stepping in the Proper Direction
 {(⊃⍵)+(-×-/⍵)×0,⍳|-/⍵}
 ⍝ 6: Please Move to the Front
 {⍵[⍋⍺≠⍵]}
 ⍝ 7: See You in a Bit
 {f←⍸∘⌽(2∘⊥⍣¯1)⋄∧/(f⍺)∊f⍵}
 ⍝ 8: Zigzag Numbers
 (∧/2 ¯2∊⍨2-/∘×2-/(10∘⊥⍣¯1))