L=[]
     for i in range(100): 
         l=[] 
         for j in range(i+1):
             if j==0 or j==i:
                 l.append(1)
             else:
                 x=L[i-1][j-1]+L[i-1][j]
                 l.append(x)
         L.append(l)
         yield l