The Barddas of Iolo Morganwg, Vol. I., ed. by J. Williams Ab Ithel, , at sacred-texts.com
There are three elements: 1 earth; fluidity; and nwyvre. Another mode: calas; fluidity; and nwyvre.
387:1 p. 386 The same number of elements is recognised in "Hanes Taliesin," Ap. Myv. Arch. v. i. p. 20:
And that turns
Between the three elements.