word length <= 2: 17 elements of F_2; series truncated after degree 4 (21 monomials occur); rank over Q = 17  -> linearly independent
word length <= 3: 53 elements of F_2; series truncated after degree 6 (83 monomials occur); rank over Q = 53  -> linearly independent
word length <= 4: 161 elements of F_2; series truncated after degree 8 (325 monomials occur); rank over Q = 161  -> linearly independent
word length <= 5: 485 elements of F_2; series truncated after degree 10 (1275 monomials occur); rank over Q = 485  -> linearly independent
