{ Situations leading to \\{midline} ... } = skipblanks+mathbr, skipblanks+tabmrk,
	skipblanks+macprm, skipblanks+supmrk, skipblanks+submrk, skipblanks+letter,
	skipblanks+otherchar, newline+mathbr, newline+tabmrk, newline+macprm,
	newline+letter, newline+otherchar

{ a } += alpha,

{b}+=beta,

{a}+=gamma,

{b}+=delta,

{a}+=epsilon,

{b}+=zeta,

{a}+=eta.