“…Specifically, that difficulty indexes presented in the first study (and in other previously published ones, Pulido, Almaraz, et al, 2010;Pulido, Hernández, et al, 2010) are an indication that superficial similarities are simply insufficient to solve. A qualitative study of the discourse produced by individuals attempting to solve this type of problems (and other LSP), also supported this assumption (Pulido, 2002). Some readers may find these arguments compelling (others may not).…”