(b) are comparable to the employee benefits of the employee immediately before ceasing to be an employee of the local port corporation and at a rate of contribution by the employee not greater than the rate that was applicable in respect of the employee immediately before ceasing to be an employee of the local port corporation; and
(b) is a clause referring to sick leave benefits.
There is barely enough context to find out what (b) is referring to; however, it seems to be referring to employee benefits or unemployment benefits, not sick leave / medical leave benefits. The system was fooled because, like me, it did not have the necessary context to judge otherwise.
( z1 clause :li "b" :ARG0-of ( z2 refer :ARG1 ( z3 benefit :ARG0 ( z4 leave :ARG1-of ( z5 sick ) ) ) ) )