From: kclan@hotmail.com   
      
   If the model is like this:   
      
   u_1 -> u_2 -> ... -> u_n   
   ^       ^             ^   
   |       |             |   
   d_1 -> d_2 -> ... -> d_n   
      
   then the model using first order will become:   
   p(u, d) = sigma p(u_i|d_i)p(d_i|d_i-1)   
      
   Now there are relations r imposed between each pair of u usch that:   
      
     r_1         r_i   
      |        |    |   
    |    |   |        |   
   |       |            |   
   u_1 -> u_2 -> ... -> u_n   
   ^       ^             ^   
   |       |             |   
   d_1 -> d_2 -> ... -> d_n   
      
   how can I formulate the model? Thankyou very much.   
      
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