Teacher:In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Teacher: Now, understand the problem? Solve this instance: Context: At E3 in June 1997, Miyamoto speculated that Mother 3 would be one of the four titles for the then-expected 1998 launch of the Japan-only peripheral Link Information: With the 1993 announcement of its new Project Reality console, Nintendo explored options for data storage. A Nintendo spokesperson said in 1993 that "it could be a cartridge system, a CD system, or both, or something not ever used before." Question: How long had the 64DD been in development when Miyamoto said Mother 3 might be one of the launch titles for the peripheral?
Student:
Answer: 4