Second step
Add another corner and the two corners of the Rubik Cube just resolved to expand the bloc into a 2x2x2 block 2x2x3. We may use three sides remained free to rotate so as not to undo the block 2x2x2, which we must avoid.
We choose one of three possible angles to continue in the resolution and try the other two corners that we need. The operation to be done is very similar to that made in the first step.
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To speed this operation is good to choose between the three edge easier to resolve, as we did in the previous case.
The position is more complicated when a piece is in the correct position compared to Cube but is turned on the wrong side. In this case, the easiest way to resolve it is to choose another angle to do.
The figure shows the Cube after this step.
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