Single Staff Polyphony

[Norman Hamilton]

Hi,

I have a question regarding single staff polyphony. When two voices share 
the same pitch LilyPond (2.6.3)  will show the two notes next to each other. 
I would like to alter this so that only one note appears with beams up and 
down. If  notes have different time values, I'd like the note with longest 
duration to be shown.

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