Four different icons, still no repeats
ABCD extends ABC's no-repeat rotation idea to a fourth icon — four genuinely different icons rotate in a fixed order, with nothing repeating anywhere in the unit. The core skill is identical to ABC's three-icon version; the only change is one more distinct position for a child to track before the rotation starts over.
A strategy for a longer rotation
Naming all four icons in order out loud, then asking "what comes right after this one?" for whichever icon sits at the edge of the visible row, applies the exact same strategy ABC uses, just extended one position further. A child who's genuinely comfortable with ABC's three-icon version usually adapts to this one quickly, since no new type of reasoning is required.
Where this leads
Tracking a longer no-repeat rotation, the skill this pattern extends, is useful preparation for reading ordered sequences with more than a couple of distinct steps — a recipe's numbered steps, a multi-step direction, a longer alphabetical or numerical sequence — all of which depend on the same "what comes next in this fixed order" reasoning.
Every numbered worksheet uses a fresh set of four icons testing this identical rotation structure.
Using this worksheet effectively
Confirming ABC already feels comfortable before introducing this fourth icon tends to make the transition smooth, since the underlying skill doesn't change. Every worksheet downloads as a free, print-ready PDF with no account required.