Help needed understanding Kim Hargreaves pattern 'Down'?

Im sure this is very simple and I might be over thinking this..that being said.. It starts with 12 rows that form the pattern. After working this pattern for some time it then says: Work 15 rows, ending with a WS row. Inc 1 st at each end of next and 2 foll 14th rows, then on 2 foll 12th rows., taking inc... show more Im sure this is very simple and I might be over thinking this..that being said..

It starts with 12 rows that form the pattern. After working this pattern for some time it then says:
Work 15 rows, ending with a WS row.
Inc 1 st at each end of next and 2 foll 14th rows,
then on 2 foll 12th rows., taking inc sts into patt.

My questions are how do I work 15 rows in a 12 row pattern?
and I just dont understand how to implement the rest

Please help!
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