Letters that make double-spacing
s, a, o, b, d, e, g, l, n, p, c, i, u are letters that make 'double-spacing'
Words within double-spacing
spa, PA, spacing, DO, do, PAC, AC, Ci, Pa, ng, double, ci, in, IN, pa, LE, Ac, In, pacing are words within 'double-spacing'