What are the sets of things in SN 1.44?

What are the sets of one, two, three, five and twelve things mentioned in the sutta below? What does it mean? From SN 1.44 (translated by Bhikkhu Sujato): > “One is the root, two are the whirlpools, three are the stains, five > the spreads, twelve the ocean’s whirlpools: such is the abyss crossed > over by the hermit.” From SN 1.44 (translated by Bhikkhu Bodhi): > “The seer has crossed over > the abyss > With its one root, two whirlpools, >Three stains, five extensions, > An ocean with twelve eddies.”