The table below shows the lists of classes available each day at a summer school. Each student must take one class each day. This class can be either in the morning or in the afternoon.
| Monday | Tuesday | Wednesday | Thursday | Friday | |
| morning | economics | geography | economics | science | economics |
| geography | science | digital technologies | digital technologies | sport | |
| art | art | art | art | art | |
| afternoon | sport | sport | maths | maths | maths |
| English | history | sport | sport | history | |
| digital technologies | economics | science | geography | geography |
Zach has chosen classes in art, geography, maths, history and English. He wants to have Friday afternoon free.