For example, if there is a L shaped sketch and you dimension from the bottom of the L to just above the horizontal part, and then you dimension the vertical part from the end point of the last dimension you'd be okay. But, if you dimensioned both of those lengths and then the total length you would be over dimensioning the sketch.
1)forget it
2) jack in the box
3)somewhere over the rainbow
4)back door???
5) read between the lines
8) check canceled
9) once upon a time
10) green eggs and ham
12) down town