When executing the code in the last problem to actually get to and execute $q=q+1,$ what needs to be true is that:

$clrn=1,ce=1,$ and a negative clock edge

clrn $=0,$ ce $=1,$ and a positive clock edge

clrn $=1,$ ce $=0,$ and a positive clock edge

clrn $=1,$ ce $=1,$ and a positive clock edge

This will never be achieved