Before revision: Languages that are attested only by a few words, often names, and a few phrases (called Trümmersprachen in German linguistics, literally "rubble languages") can be reconstructed only in a very limited way, and often their genetic relationship to other languages remains unclear.
After revision: Languages attested only by a few words, often names, and a few phrases (called Trümmersprachen in German linguistics, literally "rubble languages") can be reconstructed only in a very limited way, and often their genetic relationship to other languages remains unclear.