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 D.15.3.51 dualPart 
Procedure from library chern.lib (see  chern_lib).
 
- Usage:
 - dualPart( I [,N] ); I list of integers, N integer
  - Return:
 - list of integers
  - Purpose:
 - computes the partition dual (conjugate) to I
  - Note:
 - the result is extended by zeroes to length N if an optional integer
parameter N is given and the length of the computed dual partition
is smaller than N
   
Example:
|   | LIB "chern.lib";
// dual partition to (1, 3, 4):
list I = 1, 3, 4;
print( dualPart(I) );
==> [1]:
==>    1
==> [2]:
==>    2
==> [3]:
==>    2
==> [4]:
==>    3
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