Just as there are "neither/nor" clues, there are also "either/or" clues. The concept is much the same, only in reverse.
Here's an example: "Laura's tattoo was either the one that cost $40 or the Pisces tattoo."
If you're new to grid-based logic puzzles, this tutorial will teach you the basics. Start with the "Introduction" first, then move on to the tutorials discussing specific clues or solving methods. Each tutorial contains a number of different slides - you can advance to the next slide by clicking "Next slide" at the bottom of each page, or by using the circled numerical links below each slide. Choose your specific tutorial from the list below to get started.