I have been trying to find all duplicates within a string of letters, but I do not know where to start.
I had stretched out of all of the letters into separate tiles thinking that I would be able to use to compare tiles with If Then statements. 
I tried to manually compare each letter with if(b1=b2,"Ignore",b1). This could work, but I would have to type out the grid coordinates to compare all 81 combinations for the string.
>Solution :
To remove duplicates from a string of letters in Google Sheets, you can use the UNIQUE function. This function takes a range of cells as its input and returns a list of unique values in that range.
Here is an example of how you can use the UNIQUE function to remove duplicates from a string of letters:
- Enter the string of letters into a single cell in Google Sheets, for
example, cell A1. - In a new cell, enter the
UNIQUEfunction, for example, in cell B1,
enter the following formula:=UNIQUE(A1). This will return a list
of unique letters from the string in cell A1. - You can then use the JOIN function to combine the unique letters
into a single string. For example, in cell C1, enter the following
formula:=JOIN(",", B1). This will return the unique letters as a
comma-separated string.
Alternatively, you can also use the FILTER function to remove duplicates from a string of letters. Here is an example of how you can use the FILTER function to do this:
- Enter the string of letters into a single cell in Google Sheets, for
example, cell A1. - In a new cell, enter the
FILTERfunction, for example, in cell B1,
enter the following formula:=FILTER(A1, A1 <> ""). This will
return a list of letters from the string in cell A1, excluding any
empty values. - You can then use the
UNIQUEfunction to remove duplicates from the
list of letters. For example, in cell C1, enter the following
formula:=UNIQUE(B1). This will return a list of unique letters
from the string in cell A1. - You can then use the JOIN function to combine the unique letters
into a single string. For example, in cell D1, enter the following
formula:=JOIN(",", C1). This will return the unique letters as a
comma-separated string.
I hope this helps!