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A \underbar{b} and \underbar{b} foo

B \underbar{b} \underbar{b}, $\underbar{b}$ \underbar{b} and \underbar{b} $\underbar{b}$

C \underbar{b} \underbar{b}, $\underbar{b}$ \underbar{b} and \underbar{b} $\underbar{b}$

D \underbar{b} \underbar{b}, $\underbar{b}$ \underbar{b} and \underbar{b} $\underbar{b}$

E $\underbar{b} = \underbar{b}$

F \overbar{b} \underbar{b}

G \underbar{b \underbar{b \underbar{b} b} b} x

H \underbars{as \underbars{bs \underbars{cs} bs} as}

I \underbar{aa \underbar{bb \underbar{cc} bb} aa}

J \underbar{aa \underbar{bb \underbar{cc} bb} aa} \underbar{aa}

K \underbar{aa \underbar{bb \underbar{cc} bb} aa} xx \underbar{aa}

L \underbars{as \underbars{bs \underbars{cs} bs} as}

M \underbar{aa bb cc dd}

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