So far two obvious ones come to mind:
002: From CGV to NBR via Geylang, duplicating EWL from TNM to CTH.
147: From HGN to CLE via LTI & CNT, duplicating NEL from SGN to LTI and CQY to OTP.
162 (YCK to Shenton Way via BSH & ORC) can be considered almost like the
NSL anchor, as it calls at quite a number of NSL stations (YCK, AMK, NOV, NEW, ORC, SOM, DBG, CTH & RFP).
070 (YCK to Shenton Way via PYL & Suntec) should be used as the
CCL anchor and should not be amended or withdrawn.
066 (BDK-JUR via LTI & BTM) is likely to be the anchor of the proposed
BTL. I predict a messy exercise involving the withdrawal of 067, the splitting of 171 into 2 routes and the amendment of 065.