Oblique mark

The oblique mark ∖ above the letters implies that the notes must come in succession, the upper one first, as this mark ／ signifies a contrary succession.

Any fraction may be made by typing the numerator, the oblique mark (/), and the denominator. The oblique mark is struck with the small finger of the right hand.

Your fourth finger on your right hand strikes semicolon (;) on the home row, reaches up slightly for p, and down to the bottom row slightly right for the oblique mark (/).