d and a — all white piano keys|
c and g — one black key in the middle
c# and g# — one white key in the middle
Since you probably know your Major 5-finger Patterns, minor 5-finger patterns are easy. To change a major 5-finger pattern to a minor 5-finger pattern, simply lower the middle note a half step. The following button will choose "difficult" keys more often than easy keys. It will include all keys.