## Not run:
# createFormula(letters[1]) ## . ~ a
# createFormula(letters[1],right=FALSE) ## a ~ .
# createFormula(letters[1:3]) ## c ~ a + b
# createFormula(letters[1:4]) ## c + d ~ a + b
# createFormula(letters[1:4],right=FALSE) ## a + b ~ c + d
# ## End(Not run)
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