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Sausage's Hybrid Speed Solution
Step 5 - The Fourth Pair

The next corner cubie that we have located that has a blue sticker on it, is the RED, GREEN and BLUE corner. Simple mathematics, to take away the blue, means that it's friend is the RED and GREEN edge cubie. 

We can see them both here. Unlike the other situations so far, the edge cube is caught under the waterline instead of on the top layer. We need to position the corner cube so that when the edge cube is moved to the top, we are in either Situation No 1 or No 2. So let's have a go...

First we'll change angles so you can see what the edge cubie is going to do. Then...
Turn the white face once anti-clockwise. This strategically positions the corner cube to await the arrival of the edge cubie.
By the turning the red face once anti-clockwise, we instantly place outselves in Situation No 1. But we still have the problem of returning the RED and BLUE edge cubie to the bottom of the ocean again, without breaking up our precious Situation No 1. First we must avoid the breakup by...
...turning the white face once clockwise. This will place the pair on the opposite side of the cube and away from danger.
Return the red blue edge cubie safely to the bottom of the ocean by turn the red face once clockwise.
We are now left cleanly in Situation No 1. Viewing the cube now from another angle, we can see the red and green centres. We are viewing from this angle because our pair are RED and GREEN. This is the hole where the pair will go to.

Situation No 1 works a little differently from Situation No 2. In this case, the corner cube is the boss.

We need to take notice of the side colour of the corner cubie, which in this case is green (we ignore blue, remember?). This dominant colour must be positioned diagnally to the green centre face, and above the hole. In this case, turn the white face twice.

Once, in place, we can join the pair and move it into the hole, in the same motion...

Turn the red face once clockwise. Bang! They match together, and at the same time, the red and blue edge cube has come up to line up with the pair.
Turn the white face once clockwise. They all join in a section.
And finally, turn the red face once anti-clockwise. To bring the whole block back under the waterline.

Things are looking very neat. Only one pair to go. 

Go to Step 6.

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