Aditya, Basil, Cecilia, and Dimitri each teach one class at $\text{8:00},$ $\text{9:00},$ $\text{10:00},$ or $\text{11:00}.$ At those times, they each teach algebra, calculus, geometry, or probability. Everybody teaches at a different time, and everybody teaches a different class.

For each teacher, we’d like to know *when* they teach and *which course* they teach. Given a set of clues, how can we figure it out?

These are the makings of a logic grid puzzle. To work through this problem, keep reading. Or, skip to the challenge for a puzzle of your own.