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astrictus	drawn together
ater	black
atra	black
atrata	black
atratus	black
atro-	prefix meaning very dark
atropurpurea	dark purple
atropurpureus	dark purple
atrosanguinea	deep red
atrosanguineus	deep red
atrovirens	dark green
atrum	black
attenuata	weak
attenuatus	weak
aureata	with gold