Letters that make external storage
s, a, o, e, g, l, n, r, t, x are letters that make 'external storage'
Words within external storage
ER, OR, age, rage, te, XT, extern, RN, Ag, external, ex, storage, rag, ern, tern, RA, AL, tor, Ra, Al, Er, Ge, Rn, Na, Te, RNA are words within 'external storage'