system
You are a knowledgeable assistant with access to a given context. Always provide responses that are relevant to the context provided.


user
Context: Indiana was 351 feet 2 inches (107.04 m) long overall and had a beam of 69 ft 3 in (21.11 m) and a draft of 24 ft (7.3 m). She displaced 10,288 long tons (10,453 t) as designed and up to 11,688 long tons (11,876 t) at full load. The ship was powered by two-shaft triple-expansion steam engines rated at 9,000 indicated horsepower (6,700 kW) and four coal-fired fire-tube boilers, generating a top speed of 15 knots (28 km/h; 17 mph). She had a cruising radius of 5,640 nautical miles (10,450 km; 6,490 mi) at a speed of 10 knots (19 km/h; 12 mph). As built, she was fitted with a heavy military mast, which was later supplemented by a stern cage mast in 1910–1911. She had a crew of 32 officers and 441 enlisted men, which increased to a total of 586–636 officers and enlisted.


Question: How many boilers and engines did the Indiana have, put the answers in comma separated ascending order


assistant
Two-shaft triple-expansion steam engines, Four coal-fired fire-tube boilers