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As I have said on other occasions , our country could not undertake the construction of schools of this kind without economic development . Here , as on other occasions , I lie under a heavy disadvantage , for out of the many striking cases which I have collected , I can give only one or two instances of transitional habits and structures in closely allied species of the same genus ; and of diversified habits , either constant or occasional , in the same species . " " On other occasions , the reason is clearer : it is the government that does not wish the perpetrators or the reason for the killing to come to light . As we have said on other occasions , the mercenaries tried to land in January .