Checking Duplicates in Google docs

[mr_mhackzz]

I am an encoder of ebay and we are using google docs to encode all sold items of ebay sellers.. I would like to ask if there is any format to check duplicate cell in google docs.. below is the format of the excel.

[TABLE="width: 500"]
<tbody>[TR]
[TD="align: center"][/TD]
[TD="align: center"]F[/TD]
[TD="align: center"]G[/TD]
[TD="align: center"]H[/TD]
[TD]I[/TD]
[/TR]
[TR]
[TD]E1[/TD]
[TD][/TD]
[TD="align: center"][/TD]
[TD="align: center"]Hello kitty plush doll pink[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]E2[/TD]
[TD][/TD]
[TD][/TD]
[TD="align: center"]Transformer Megatron[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]E3[/TD]
[TD][/TD]
[TD="align: center"]Duplicate (E1)[/TD]
[TD="align: center"]Hello kitty plush doll pink[/TD]
[TD][/TD]
[/TR]
</tbody>[/TABLE]

In addition to that, If ever, If I put item names in Column H that has duplicate, the cell will turn into red cell.

Any response will be highly appreciated .