This is another challenging one. The interval called a perfect 4th is the distance of 4 half steps between two notes. We are now watching for the skip from a line to a space or a space to a line.  There is one interval in the above exercise bigger than a 4th. Did you find it?
The interval of a perfect 5th is the distance of 7 half steps between two notes. Now we are watching for a line to a line (skipping a line) or space to space (skipping a space). 
Back to Lesson 10
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= 60