There is a variation for this album. The correct printing for
the album shows the pages paired alternatively in yellow or green,
with green pages for 2 and 3, then 6 and 7 and so on, whilst there
are yellow pages for 4 and 5, then 8 and 9 and so on.
The error album has a reversal of colours from early on in the
album which leads to the green pairing being followed by another
green pairing, then yellow.