Nothing
project(c(1,0), c(1,1))
project(c(1,0), c(1,-1))
project(c(1,0), c(1,2))
project(c(1,2,3), c(1,1,1))
fractions(project(c(1,1,1), c(1,2,3)))
project(c(1,2,3), c(1,-1,0))
project(c(1,2,3,4), c(1,1,-1,-1))
project(c(1,1,-1,-1), c(1,-1,1,-1))
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