(a,1)(b,1)(c,1)(d,1)(e,1)(f,1)(g,1)(h,1)(i,1)(j,1)(k,1)(l,1)(m,1)(n,1)(o,1)(p,1)(q,1)(r,1)(s,1)(t,1)(u,1)(v,1)(w,1)(x,1)(y,1)(z,1)
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
1
NULL == NULL: 1
(a,1)(b,1)
(e,1)(f,1)
(a,1)(b,1)(c,1)(d,1)(e,1)(f,1)
(a,1)(b,1)(c,1)(d,1)(e,1)(f,1)
(c,1)(d,1)
(c,1)(d,1)
(a,1)(b,1)(c,1)(d,1)
(c,1)(d,1)(e,1)(f,1)
0
(a,1)(b,1)(c,1)(d,1)(e,1)(f,1) == (a,1)(b,1)(c,1)(d,1)(e,1)(f,1): 1
