b1 ^[1] b2 ^[1] b3 ^[1]

a-a ^[a] a-b1 ^[b] a-b2 ^[b]

A-a ^{[upper-alpha 1]} A-b1 ^{[upper-alpha 2]} A-b2 ^{[upper-alpha 2]}

r-a ^{[lower-roman 1]} r-b1 ^{[lower-roman 2]} r-b2 ^{[lower-roman 2]}

R-a ^{[upper-roman 1]} R-b1 ^{[upper-roman 2]} R-b2 ^{[upper-roman 2]}

d-a ^{[decimal 1]} d-b1 ^{[decimal 2]} d-b2 ^{[decimal 2]}

g-a ^{[lower-greek 1]} g-b1 ^{[lower-greek 2]} g-b2 ^{[lower-greek 2]}

X-a ^{[abcdefgh 1]} X-b1 ^{[abcdefgh 2]} X-b2 ^{[abcdefgh 2]}