Accidentals

[Vassily Checkin]

Hello,

Probably this is something well-known, but it seems like
there is no easy way to get a readable output from the following
snippet (flat sign gets obscured by the natural)
Lilypond version 1.4.12.

\score {
   \notes {
     \key b \minor \time 4/4
     <c'4 bes> s2.
   }
}

--Vassily