\input zb-basic \input zb-ioport \iteman{io-port 05878098} \itemau{Yoshinaka, Ryo} \itemti{Efficient learning of multiple context-free languages with multidimensional substitutability from positive data.} \itemso{Theor. Comput. Sci. 412, No. 19, 1821-1831 (2011).} \itemab Summary: Recently, {\it A. Clark} and {\it R. Eyraud} [J. Mach. Learn. Res. 8, 1725--1745 (2007)] have shown that substitutable context-free languages, which capture an aspect of natural language phenomena, are efficiently identifiable in the limit from positive data. Generalizing their work, this paper presents a polynomial-time learning algorithm for new subclasses of multiple context-free languages with variants of substitutability. \itemrv{~} \itemcc{} \itemut{grammatical inference; mildly context-sensitive grammars; multiple context-free grammars} \itemli{doi:10.1016/j.tcs.2010.12.058} \end