Remove unused snapshot?

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snapshotid=(
snap-xxxxxxxxxxxxxxxx
snap-xxxxxxxxxxxxxxxx
snap-xxxxxxxxxxxxxxxx
snap-xxxxxxxxxxxxxxxx
)
COUNTER=0
for (( i=0; i<${#snapshotid[@]}; i++ ));
do
  COUNTER=$((COUNTER+1))
     echo "++++";
         echo $COUNTER". Removing the Snapshot with the Snapshot ID: " ${snapshotid[$i]};
              aws ec2 delete-snapshot --snapshot-id ${snapshotid[$i]};
   done

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