Day 1: A1+B1, A2+B2
Day 2: A3+B3, C1+D1
Day 4: A4+B4, C2+D2
Day 6: C3+D3
Day 8: A5+B5, C4+D4
Day 9: E1+F1
Day 11: E2+F2
Day 13: E3+F3
Day 16: A7+B7, C5+D5, E4+F4
Day 23: E5+F5
Day 30: C6+D6
Day 37: E6+F6, A8+B8, C7+D7

My performance on A8+B8 (i.e. the eighth pass of A+B) had fallen a little from A5+B5. My performance on C6+D6 had also fallen a little from repetition C4+D4. C+D and E+F both had the same repetition intervals up to the sixth pass, but my performance on E6+F6 was better than that on C6+E6. Its advantage had more than halved since the first repetitions of these batches, but I expected the gap to have narrowed more. This raises the suspicion that E+F might have been a little easy relative to C+D. However, the chart below shows the number of problems that were solved in under 5 seconds on my first pass through each of the batches:
The overall picture is clearly one of steady improvement. [Diagram corrected 28 May 2011.]
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