S1U1B3T1L1E1S1T1
10 points
SUBTLEST is validvalid
SUBTLE, so slight as to be difficult to detect [adj]
SUBTLE, so slight as to be difficult to detect, also SUBTIL, SUBTILE [adj]
SUBTLE, so slight as to be difficult to detect [adj]
SUBTLE, so slight as to be difficult to detect, also SUBTIL, SUBTILE [adj]