Liars and Knights!

Logic Level 1

An island is inhabited by both liars and knights.Every knight always tells the truth and each liar always lies. One day 12 islanders gathered together and issued a few statements.There is a mix of liars and knights amongst this group.
Two people said,"Exactly two of us are liars''.
Another four people said''Exactly four of us are liars''.
The remaining six said''Exactly six of us are liars''.

How many liars are there?


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