Letters that make unidirectional
a, o, d, e, l, n, c, r, t, i, u are letters that make 'unidirectional'
Words within unidirectional
id, re, ti, IR, EC, UN, direct, dire, directional, direction, on, ECT, ire, CT, AL, ID, Io, ion, Re, Al, Ir, Ni, Na, Ti are words within 'unidirectional'