Table schema:
CREATE TABLE table_1889619_5 (total_footage_remaining_from_missing_episodes__mm VARCHAR, story_no VARCHAR, source VARCHAR)

Question: When a private individual is the source and 018 is the story number what is the total footage remaining from missing episodes (mm:ss)?
SQL: SELECT total_footage_remaining_from_missing_episodes__mm AS :ss_ FROM table_1889619_5 WHERE story_no = "018" AND source = "Private individual"