The transformations are:
order=1:
e = [E0 E1][1].[1] [E2 0][e] [n] n = [N0 N1][1].[1] [N2 0][e] [n]
e = [E0 E1 E3][1 ] [1 ] [E2 E4 0][e ].[n ] [E5 0 0][e²] [n²] n = [N0 N1 N3][1 ] [1 ] [N2 N4 0][e ].[n ] [N5 0 0][e²] [n²]
e = [E0 E1 E3 E6][1 ] [1 ] [E2 E4 E7 0][e ].[n ] [E5 E8 0 0][e²] [n²] [E9 0 0 0][e³] [n³] n = [N0 N1 N3 N6][1 ] [1 ] [N2 N4 N7 0][e ].[n ] [N5 N8 0 0][e²] [n²] [N9 0 0 0][e³] [n³]
In other words, order=1 and order=2 are equivalent to order=3 with the higher coefficients equal to zero.
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