Putting the question and answer together, it appears that Table 9 is saying there are 4 groups. 2 of them are of a length and 2 are of a different length (in terms of DataWords).

Is that correct?

I should interleave all four block groups until the first two have been exhausted - and then interleave the remainder of the second 2 block groups until they have also been exhausted - which should equal the total number of DataWords in the QRC.

Is that also correct, please?