Compact solution scheme for 'akzonobel' problem
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Initialization summary:
y1, y2, y3, y4, y5
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k = -1:  [] : y5
         [] : y4
         [] : y3
         [] : y2
         [] : y1
k =  0:  [f6] : y6
         [f5] : y5'
         [f4] : y4'
         [f3] : y3'
         [f2] : y2'
         [f1] : y1'
