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{f⌿⍵}   for f one of + ⌈ ⌊ or ∧ ∨ = ≠ for boolean right arguments;
also / instead of for vector right arguments
{⍺(f⌿⍵)}
{⍺,f⌿⍵} for numeric left arguments

 
{≢⍵}
{⍺(≢⍵)}
{⍺,≢⍵} for numeric left arguments

 
{≢∪⍵}
{⍺(≢∪⍵)}
{⍺,≢∪⍵} for numeric left arguments

 
{⊂⍵}
{⍺⍵}
{⍺} also