user: Question: What aRe the manuals with a kind of R, and an opus of 144?
Columns: ['year', 'opus', 'town', 'kind', 'manuals', 'stops']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1972', '76', 'Eugene', 'NB', 'IV/P', '38']
SQL:

assistant: SELECT "manuals" FROM "Table" WHERE "kind" = 'R' AND "opus" = '144';