r - How add two text objects -

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how add sum information 2 texts? example:

obj1 <- c("a","e","i","o","u")

now, how can have object “ba”, “be”,… “bu”? tried: 

obj2=c("b"+ obj1)

but doesn't work.

if in r, 

obj1 = c("a","e","i","o","u") obj2 = paste("b", obj1,sep='')`

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