New Constructs: Tally with Key IV Index   <<   >>


{⍺(≢⍵)}⌸y 1.5

 
   
{⊖sort⍕{⍺(≢⍵)}⌸⍵[;⍳3]}
{⊖⍕(↓b⌿t),⍪-2-/¯1,b/⍳⍴b←∨/(1↓t⍪' ')≠t←sort ⍵[;⍳3]}