union

Function: union { a b -> c }

file: 100-C-lists.t
package: muf
status: alpha

Does just what you expect:

root:
[ 'a' 'b' 'c' | ]set   [ 'b' 'c' 'd' | ]set   union   keys[
root: [ 'a' 'b' 'c' 'd' |
]pop
root:
[ "a" 'a' "b" 'b' "c" 'c' | ]index   [ "b" 'b' "c" 'c' "d" 'd' | ]index   union   ls
"a"	'a'
"b"	'b'
"c"	'c'
"d"	'd'
root: 

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