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You replace the element with 'X' while iterating, and again whn you are checking the previous element with [j-1] , if it is 'X' it will check if your element is greater than 'X'., so you should check if your [j-1] or [i-1] is 'X' or not. Just add this to your if statement.

## Cavity Map

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You replace the element with 'X' while iterating, and again whn you are checking the previous element with [j-1] , if it is 'X' it will check if your element is greater than 'X'., so you should check if your [j-1] or [i-1] is 'X' or not. Just add this to your if statement.

Python can evaluate strings including numbers and letters

As you iterate through the grid the cavities are marked with the

`'X'`

where all the adjacent cells are less than. For examplereturns with no cavities as

`9`

and`9`

are equal.If we replace with an

`X`

it is because the surrounding cells evaluate as less than.So if

`9 > 8`

so too is`X > 8`

so the relationship between the cells is maintained and there is no need to check for`X`