rEmbedded ImageEmbedded Image
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    i′=η[η(η[i,j],k)]
20Embedded Image
    i′=η(i,j), k′=η(k,l)
3Embedded ImageEmbedded Image
    i′=η(i,j)
40Embedded Image
5Embedded ImageEmbedded Image
    k′=η(k,l)
60Embedded Image
    k′=η(k,l)
7Embedded ImageEmbedded Image
8Embedded ImageEmbedded Image
    Embedded Image
90Embedded Image