Search engine is done at the moment, so a quick query for you SQ regulars.

What is the hierarchy of SQ economy booking codes? From the *A thread they are listed as:
SQ Singapore
EC : S Y B M H W U E K G Q N V T X

Are these correct? Using KVS gives a hierarchy as follows:

HKG Hong Kong Int'l HK [VHHH] to SIN Singapore Changi SG [WSSS]
S Y E B M W Q N H V T L K

Behind my query is a problem I'm having with TG who assert that the W class fare I purchased on SQ (HKG-SIN return) is non-mileage accrual to ROP. The ROP website has changed after my purchase, and my SQ e-ticket states that the fare IS mileage accruable. Cheers.

TK