Degenerate Bow

[Will Oram]

When working on a single staff, I get this warning:

programming error: Degenerate bow: infinite steepness reqd (Continuing; 
cross thumbs)

Through lots of commenting out I have attributed the problem to this 
measure:

< g' e' >-.[ a,!-. < csharp a' >-. e,-.] < csharp' bflat' >-.[ e,-. < e 
c' >-. a,-.] < e' csharp' >-.[ a,-. < e' g >( < f a >])
                < g bflat >-.[ a,-. < b! d >-.( < csharp e >]

It looks perfect on PDF, but I suspect it's causing my set \breaks to 
screw up. What did I miss?

Will Oram
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