Chelas and Stelma are required to leave their respective stations immediately to pursue any prisoner who attempts to escape from their sector. ████████████ ██████ ████ ███ ████████ ████ █ █████████ ██████ ███ ██████ ███ █████████ ██ █████ █████ ████████ █████ █████ ████████████ ████ ████████ ██ ███ ██ ██ █ █████ ████ ██████ ███ ██████ ████████ ███ █████████ █████ ██ █████ ██████ ███ █████ ████████████ ████████ ██ ███ ██████████ ████ ██████ ███ ████████ █████ █████ ███ ██████ ███ ████
For both C and S, if a prisoner tries to escape from their sector, C and S must leave their respective stations to pursue the prisoner.
If they are not pursuing an escaped prisoner, C and S cannot leave their stations until their replacements have arrived.
On May 11 at 9pm, C and S finished a four-hour shift and their replacements arrived at the end.
C had violated the rules described. S had not violated the rules described.
There’s no clear inference to draw, because there are many ways in which C could have violated the rules and S would not violate the rules. Let’s use process of elimination to identify what must be false.
If the statements above are █████ ████ ██ ███ █████████ █████ ██ ████ ███████
Chelas and Stelma ████ ██ █████ ██████████ ████████ ██ █ ████
Stelma left her ███████ ██████ █ ████ ███ ██████ ███ ████
Chelas left his ███████ ██████ █ ████ ███ ██████ ███ ████
A prisoner attempted ██ ██████ ████ ██████ ███ ████████ ██████ ██ █ ████ ███ ███████ ██████ ███ ██████ ████ ███ ██ ███ ███████ ██████ █ ████
A prisoner attempted ██ ██████ ████ ██████ ███ ████████ ██████ ██ █ ████ ███ ████ ██████ ███ ██████ ████ █████ ████████ ██████ █ ████