For an additional Í-fold plugging of scheme Â into Á:

After choosing the tool [User-Defined \ Í-fold Scheme-Socket _ _ ]

1) Click on number 30

2) Ctrl+Click on the (red) unit of scheme A

3) Click on the (green) unit of scheme B

4) Click on the last radius of scheme A (is a leaf of the tree)

5) Click on the side (basis of the angle) of scheme B

For a more general construction (roots of x^2 + n) look at the file: Roots.html .

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