Context: The Czechs' language separated from other Slavic tongues into what would later be called Old Czech by the thirteenth century, a classification extending through the sixteenth century. Its use of cases differed from the modern language; although Old Czech did not yet have a vocative case or an animacy distinction, declension for its six cases and three genders rapidly became complicated (partially to differentiate homophones) and its declension patterns resembled those of Lithuanian (its Balto-Slavic cousin).

Question: By the thirteenth century, what had the Czech language separated from?
Answer: other Slavic tongues

Question: How long was the precursor to Czech classified as Old Czech?
Answer: through the sixteenth century

Question: How did Old Czech's use of cases differ from modern usage?
Answer: did not yet have a vocative case or an animacy distinction

Question: How many cases did Old Czech have?
Answer: six

Question: What other language did Old Czech's declension patterns resemble?
Answer: Lithuanian

Question: What other languages did Lithuanian separate from?
Answer: Unanswerable

Question: What was Lithuanian called by the thirteenth century?
Answer: Unanswerable

Question: How many cases did Lithuanian have?
Answer: Unanswerable

Question: How many genders were used in Lithuanian in the past?
Answer: Unanswerable

Question: How long was Lithuanian considered Old Czech?
Answer: Unanswerable