 Usage:  k=fnzzci(x,z,a,b,c,d)  
 
 Input:

  x                      matrix 
                         
  z                      matrix 
                         
  a                      integer 
                         
  b                      integer 
                         
  c                      matrix 
                         
  d                      integer 
                         
 Output:

  k                      matrix 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
