Letters that make file name extension
s, a, o, e, f, l, n, m, t, i, x are letters that make 'file name extension'
Words within file name extension
file, Sion, AM, file name, te, si, XT, en, SI, ex, on, ten, il, tension, extension, name, IL, ME, Io, ion, LE, Am, Si, Na, Te are words within 'file name extension'