add-zero  = $(add)
add-one   = $(add,1)
add-three = $(add,1,-1,2,1)

one-zero = $(one)
one-one  = $(one,foo bar)
one-two  = $(one,foo bar,baz)

one-or-more-zero  = $(one-or-more)
one-or-more-one   = $(one-or-more,foo)
one-or-more-three = $(one-or-more,foo,bar,baz)

location-1 := $(location)
location-2 := $(location)