Not totally true. Sometimes buses appear on different services
daily.
Sometimes 196 on first day,196e on third day, 38 , 222, 81, etc
...
Very hard to take some of them.
.
SBS 9682 Z is a Dennis Trident ( only 20 in S'pore ). If you do not
take 89 / 80 / other svc with perm Dennis Trident daily, to take
one svc with cameo DT is rare.
But 89 got perm Dennis Trident. 