how to open the lock on diary

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how to open the lock on diary

got the dates from the bottom of the pictures, but now what?help!


The dates form a pattern: 20-02, 18-04, 16-06.

The first number is decreasing by 2, and the second number is increasing by 2.

That would make the next number in the series 14-08.

i cant understand the codes...WHAT IS THE CODE?

 

THE  CODE  IS   1   4   0   8