for f being FinSequence of (TOP-REAL 2)
for G being Go-board st ( for n being Nat st n in dom f holds
ex i, j being Nat st
( [i,j] in Indices G & f /. n = G * (i,j) ) ) & f is special & ( for n being Nat st n in dom f & n + 1 in dom f holds
f /. n <> f /. (n + 1) ) holds
ex g being FinSequence of (TOP-REAL 2) st
( g is_sequence_on G & L~ f = L~ g & g /. 1 = f /. 1 & g /. (len g) = f /. (len f) & len f <= len g )