In 1879-81 with number built 4, what is the LMS nos?
CREATE TABLE "hugh_smellie_1878_1890" (
  "class" real,
  "date" text,
  "builder" text,
  "no_built" real,
  "1919_nos" text,
  "lms_class" text,
  "lms_nos" text
);
SELECT "lms_nos" FROM "hugh_smellie_1878_1890" WHERE "date"='1879-81' AND "no_built"=4;