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. 
( z0 stake-out :ARG0 ( z1 they ) :ARG1 ( z2 he ) :time ( z3 or :op ( z4 date-entity :weekday ( z5 monday ) ) :op ( z6 date-entity :weekday ( z7 tuesday ) ) ) )
(z0 / stake-out-02
    :ARG0 (z1 / they)
    :ARG1 (z2 / he)
    :time (z3 / or
              :op1 (z4 / date-entity
                       :weekday (z5 / monday))
              :op2 (z6 / date-entity
                       :weekday (z7 / tuesday))))
They staked him out on either a Monday or a Tuesday .
z0 :ARG0 z1
z0 :ARG1 z2
z4 :weekday z5
z3 :op1 z4
z0 :time z3
z3 :op2 z6
z6 :weekday z7