traditionally reconstructed as "sheep" (Sanskrit ), is a good candidate for again reconstructing, as (with an o-colouring laryngeal), rather than an ablauting o-grade. Perhaps the most convincing confirmation comes from the inflection of the perfect: a Sanskrit root like "sit" has for "I sat" and for "he, she, it sat". The conventional 19th century wisdom saw it as some kind of "therapeutic" reaction to the Indo-Iranian merger of the endings "I" and "he/she/it" as , but it was troubling that the distinction was found only in roots that ended with a single consonant. That is, "saw" is both first- and third-person singular, but a form like would have been allowed by Sanskrit syllable structure. The mystery was solved when the ending of the perfect in the first person singular was reanalyzed, on the basis of Hittite evidence as , beginning with an a-colouring laryngeal. In other words, while Brugmann's Law was still operative, a form of the type in the first-person singular did not have an open root syllable. A problem for the interpretation is that roots that quite plainly must have ended in a consonant cluster including a laryngeal, such as < "beget" and therefore should have had a short vowel throughout (like "see" < ) nevertheless show the same patterning as : first-person singular, third-person singular. Whether that is a catastrophic failure of the theory or just levelling is unsure, but after all, those who think the pattern seen in roots like has a morphological, not phonological, origin, have their own headaches, such as the total failure of this "morphological" development to include roots ending in two consonants. Such an argument would anyway cut the ground out from under the neat distributions seen in the kinship terms, the special behaviour of "ox" and so on. Perhaps the most worrisome data are adverbs such as Sanskrit , Greek (< ) (meaning "motion from or to a place or location at a place", depending on the case of the noun that it governs) and some other forms, all of which appear to have ablauting vowels. They also all have a voiceless stop after the vowel, which may or may not be significant. Current status Brugmann's Law is widely accepted among specialists in Indo-European and Indo-Iranic linguistics. Jerzy Kuryłowicz, the author of the explanation of the matter (in his Études indoeuropéennes I), eventually abandoned his analysis for of an appeal to