m2 =
e-f b-c, no black key in between
M2 =
2nds that are not e-f, b-c
M3 =
c-e, f-a, g-b
m3 =
Every 3rd that is not c-e, f-a, g-b
A4 =
f-b
P4 =
All 4ths that are not f-b
d5 =
b-f
P5 =
Every 5th that is not b-f
m6 =
e-c, a-f, b-g
M6 =
Every 6th that is not e-c, a-f, b-g
Trick between m6 and M3
the notes are reversed to equal the other version
M7 =
f-e, c-b. reverse of m2
m7
all7ths that are not f-e, c-b