Polyphony clarification

[Charles Gran]

A couple of questions about polyphony:

1. In this excerpt should I use "\new Voice" twice or can I just use 
"\voiceTwo" the second time?
2. Could \voiceOne be assumed?
3. \upper and \lower as mentioned in 6.3.4 in the manual aren't 
really commands are they.

Charles


\relative c {
  \clef bass
  \key a \minor
  \time 2/2
| r2 e | r f4( d) | ees f g aes | r1 |
r2. << { \voiceOne b,8^\markup { div.} c \oneVoice }
\new Voice { \voiceTwo b8 c } >> |
<< { \voiceOne c1( e) c ~ c e \oneVoice }
\new Voice { \voiceTwo e,1( b') e, ~ e b' } >> }


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