In two previous experiments the senior author had found that pleasant, unpleasant, and indifferent pairs of words could be learned and retained with approximately equal efficiency. In those experiments the two words in a single pair were P, U, or I; in the present investigation the pairs were made up of words that were P-U, U-P, P-I, I-P, U-I, and I-U to the subject. The 468 words used in the present study were the same as those used in the previous experiments. The combined average results for 50 subjects on learning and on retention yield scores for the six different kinds of pairs of words which are approximately the same. The differences between the averages are unreliable; and the most significant feature of the results is the large amount of overlapping in the individual scores. The most plausible conclusion seems to be that there is little, if any, difference in the relative efficiency of learning and retaining P-U, U-P, P-I, I-P, U-I, and J-U pairs of words. (PsycINFO Database Record (c) 2006 APA, all rights reserved)