This occurs in Bar 4 of Part A where I play BCD' AD’ BF’G’F’ instead of B Cn BF’G’F’
Variation 2
This variation occurs in Bars 4 and 5 of Part B where I play the notes F’ D’E’ F’B’B’A / F’E’E’D’ E’ E’F’ in place of F’ D’E’ F’B’A’F’ / E’D’BA BCD’ E’F’