This is useful way of patching together factors from multiple sources
that really should have the same levels but don't.
A factor, or list of factors.
fa <- factor("a")
fb <- factor("b")
fab <- factor(c("a", "b"))
c(fa, fb, fab)
fct_c(fa, fb, fab)
# You can also pass a list of factors as the first argument
fs <- list(fa, fb, fab)
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