<prompt> Refer to the passage below and then answer the question afterwards in the same language as the passage: Passage: In the early 1990s, Gulfstream Aerospace and the Sukhoi Design Bureau began a joint effort to develop a supersonic small business jet, code named the S-21. Due to questionable market demand for commercial supersonic air travel, commitment to the project weakened and delays mounted.Gulfstream eventually dissolved the partnership, although Sukhoi continued work on the S-21. Mubvunzo: Ndezvipi vaviri ndege makambani akasikwa pamwe?  <response>: S-21 