inserting iptables rules

How do I insert a rules in the top of current iptables ?

Example, current rules :

aaaaa
bbbbb
ccccccc
ddddd

I want to insert zzzzz on top of aaaaa, so the list will be :

zzzzz
aaaaa
bbbbb
ccccccc
ddddd

Thanks.

 

 

 

 

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