I mean fail to get "(by row) 1, 1, 2; 1, 2."
The large image is below:
Does "(by row) 1, 1, 2; 1, 2" mean "row 1, row 1, row 2; row 1, row 2"?
Context:
Fig. 7 Generating new concepts.
(A) Humans and machines were given a novel alphabet (i) and asked to produce new characters for that alphabet. New machine-generated characters are shown in (ii). Human and machine productions can be compared in (iii).
The four-character grids in each pair that were generated by the machine are (by row) 1, 1, 2; 1, 2. (B) Humans and machines produced new characters without a reference alphabet. The grids that were generated by a machine are 2; 1; 1; 2.
More:
http://www.sciencemag.org/content/350/6266/1332/F7.expansion.html