theorem :: GOBRD13:33

for n being Nat
for G being Go-board
for f being standard special_circular_sequence st 1 <= n & n + 1 <= len f & f is_sequence_on G holds
( left_cell (f,n,G) c= left_cell (f,n) & right_cell (f,n,G) c= right_cell (f,n) )