So, say that the first
available left column is represented by 1, and the last available right column is represented by 2.
Available would mean we haven't covered
all the letters in that column yet.
So, our pattern for the column we're on would be 121212 repeating.
Now, let's
represent keys by the next numbers, so 3, 4, 5
3, on the first column left-to-right, would be Q
4, A
and 5, Z
We start on a 1 column, QAZ and type 5454, then a 2 column, PLM, and type the same.
We go back to our QAZ column and type 4343, and go to the 2 column, PLM, and the same.
We repeat this, so
ZAZA - 5454 on QAZ
MLML - 5454 on PLM
AQAQ - 4343 on QAZ
LPLP - 4343 on PLM
QAZ and PLM become unavailable, and we move on to WSX and OKN.
Then, the entire rest of the keyboard, coming in from both sides.