w1 = [ 1  
       2   
      -1  
       3 
       5]

w2 = [-1 
       1 
       4 
      -2 
       0]
 
w3 = [ 1 
       1 
      -1 
       3 
      12]

w4 = [ 0 
       4 
       3 
       1 
      -2]
