Letters that make Kepler's first law
s, a, e, f, k, l, p, r, t, i, w are letters that make 'Kepler's first law'
Words within Kepler's first law
ER, la, IRS, IR, Kepler, fir, first, law, LA, Ler, LE, Er, Ir, La are words within 'Kepler's first law'