To assess possible learning within sessions, performance on individual trials (correct or incorrect) is shown for selected sessions. Session number is indicated in parenthesis for each data set. For the first teaching sessions with A → B and B → C relations (sessions 1 and 14, respectively), the data are shown for the first 24 trials of each session. For the test sessions with B → A, C → B, A → C, and C → A relations (sessions 12, 16, 18, 20, and 27), the data are shown for all probe trials (12 per session). For the whole class tests, data are shown for the first 12 trials of the first session of each test (sessions 40 and 41).