user: Question: Name the number of semifinals for TT2
Columns: ['Athlete', 'Class', 'Event', 'Round 1', 'Round 2', 'Round 3', '1/8 Finals', 'Quarterfinals', 'Semifinals', 'Final/ Bronze medal contest']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Andreas Vevera', 'TT1', 'Singles', 'Cho ( KOR ) L 2-3', 'Kilger ( GER ) W 3-0', 'Fernandez ( CUB ) W 3-0', 'N/A', 'N/A', 'Lee ( KOR ) W 3-1', 'Cho ( KOR ) W 3-0']
SQL:

assistant: SELECT COUNT("Semifinals") FROM "Table" WHERE "Class" = 'TT2';