# Tally + Tally -- union of tallies

• Operator: +

## Description

x + y -- produces the union of two tallies.

One of the arguments may be a Set.

 i1 : x = tally {a,a,a,b,b,c} o1 = Tally{a => 3} b => 2 c => 1 o1 : Tally i2 : y = tally {b,c,c,d,d,d} o2 = Tally{b => 1} c => 2 d => 3 o2 : Tally i3 : x + y o3 = Tally{a => 3} b => 3 c => 3 d => 3 o3 : Tally