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The
+
function returns the sum of two objects, as follows:
a b
->
c
#a #b
->
#c
[a] [b]
->
[c]
[[a]] [[b]]
->
[[c]]
{a} {b}
->
{a b}
{a} obj
->
{a obj}
obj {a}
->
{obj a}
a_u
1
b_u
2
->
c_u
2
(a) (b)
->
(c)
"a" "b"
->
"c"