Question

These were the first two words in the full name of the Perl conference until around 2017, when it just became The Perl Conference. In 2004, Koichi Sasada implemented a Ruby VM whose name began with these two words, which became standard as of Ruby 1.9. The GNU project Bison descended from an influential compiler created by Stephen (15[1])C. Johnson whose name begins with these (15[1])two words; that “compiler compiler” produces (15[1])a (15[1])shift-reduce parser in C. The most popular Russian search engine (15[1])has a name that combines these two words with (*) “indexer”. These two words began the original name of a “Markup Language” based on JSON (“JAY-sawn”) that typically uses only whitespace indentation to denote structure. These two words are followed by “Hierarchical Officious Oracle” in the backronym for a company founded by Jerry Yang. For 10 points, name these two words abbreviated “YA” that suggest something is not original. ■END■

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