Question: What is the smallest of the four main islands of Japan where the Acronicta digna moth can be found?
Sentence (from "Shikoku"): Its ancient names include "Iyo-no-futana-shima" (伊予之二名島 ), "Iyo-shima" (伊予島 ), and "Futana-shima" (二名島 ).
Relevant evidence: No