In the Winners Section the L-codes mean the Losers
Section round in which the (losing) player enters. In the
Losers Section the L-codes reference to the Winners
Section (helpful to understand sudden appearances of new
players in several rounds of this section).
The first eight players who lose two games drop out of the
Challenger tournament. These players thus are the losers of
the 1st and 2nd round in the losers section.
The players who drop out like this can of course re-enter the
next edition of the challenger tournament by normal means.