Petruccelli, analysing the July 98 PME, finds that 77 denominations were mentioned by only one person in the sample. Twelve are misunderstandings, as respondents used terms of national or regional origin ("francesa, italiana, baiana, cearense"). Many of the racial terms are (or could be) remarks about the relation between skin colour and exposure to sun ("amorenada, bem morena, branca-morena, branca-queimada, corada, bronzeada, meio morena, morena-bronzeada, morena-trigueira, morenada, morenão, moreninha, pouco morena, queimada, queimada de sol, tostada, rosa queimada, tostada"). Others are clearly variations of the same idea ("preto, negro, escuro, crioulo, retinto", for black, "alva, clara, cor-de-leite, galega, rosa, rosada, pálida", for White, "parda, mulata, mestiça, mista", for "parda"), or refinements of the same concept ("branca morena, branca clara"), and can be grouped together with one of the chiefly used racial terms without falsifying the interpretation. Some responses seem to express an outright refusal of classification: "azul-marinho" ("navy blue"), "azul" ("blue"), "verde" ("green"), "cor-de-burro-quando-foge". In the July 1998 PME, the categories "Afro-Brasileiro" ("Afro-Brazilian") and "Africano Brasileiro" ("African Brazilian") were not used at all; the category "Africano" ("African") was used by 0.004% of the respondents. In the 1976 PNAD, none of these terms was used even once.