def is$\_$not$\_$given$\_$symbol$($row: int, col: int, grid: list$[1$ist$[$str$]],$ symbol: str$)$ bool:

$"*-$Return True if and only if the grid cell with row position row and column position col is NOT symbol.

Preconditions:

$$ row & len$($grid$)$

len$(grid[i])==1$col

elen$(grid[i])==1$ en$($grid$)$

for each value of $i$ in range$(1$en$($grid$))$

is not given$\_$symbol $(1,1,$ my$\_$grid, UnikNOWN$)$

True

is is$\_$not$\_$given$\_$symbol $($e$,1,$ my$\_$grid, URikulaw$)$

felse