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 Cross

 |1x1xx1x1

 |1x1xx2x2

 |2x2xx2x2

 |1x1xx3x3

 |3x3xx3x3

 |2x2xx2x2

 |4x4xx4x4

 |2x2xx3x3

 |2x2xx4x4

 |3x3xx3x3

 |3x3xx4x4

 |3x3xx5x5

 |4x4xx4x4

 |4x4xx5x5

 |4x4xx6x6