CREATE TABLE table_53082 ("Height  ( m. ) " TEXT, "No. of times visited" FLOAT, "No. of HC climbs" FLOAT, "First time as HC climb" FLOAT, "Most recent" FLOAT)

How many HC climbs had 1 visit more recently than 1984, a first HC climb before 1994, and a height of 1900?
SELECT "No. of HC climbs" FROM table_53082 WHERE "No. of times visited" = '1' AND "Most recent" > '1984' AND "First time as HC climb" < '1994' AND "Height (m.)" = '1900'
SELECT "No. of HC climbs" FROM "table_53082" WHERE "First time as HC climb" < '1994' AND "Height (m.)" = '1900' AND "Most recent" > '1984' AND "No. of times visited" = '1'