Catch the Thief<br>The police were trying to catch a neighborhood thief. They decided to stake-out the entire area that night. They didn't catch the thief so decided to continue the stake-out. Four nights later they saw the thief. All the police officers rushed to grab the guy and they caught him.
They staked him out on either a Monday or a Tuesday.
If they started the stakeout on a Wednesday, then four days later would have been a Sunday and they wouldn't have been doing it on a Mon or Tuesday. However they might have been. There is no way to know. 
( z1 stake-out :ARG0 ( z2 they ) :ARG1 ( z3 he ) :time ( z4 or :op ( z5 date-entity :weekday ( z6 monday ) ) :op ( z7 date-entity :weekday ( z8 tuesday ) ) ) )