This one is fairly easy. Write the verb ff .
(ff 1);(ff 2);(ff 3);(ff 4);(ff 5);ff 6
+-+---+------+----------+---------------+---------------------+
|2|2 6|2 6 30|2 6 30 210|2 6 30 210 2310|2 6 30 210 2310 30030|
+-+---+------+----------+---------------+---------------------+
--Kip Murray
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