Table:
Characteristics of the BTR-60 production models

BTR-60P
early BTR-60PA
BTR-60PA
BTR-60PA-1
BTR-60PAI
BTR-60PB

Weight
(tonnes)

9.8[15]

10.2[15]

10.3[15]
?
10.3[15]

Height
(metres)

2.06 m[11]

2.31 m[5][6]

Crew

2 + 16[5][6]

3 + 14[5]

Primary armament

7.62 mm PKT, SGMB or PKB tank/medium/general-purpose machine gun (2,000 rounds)[6]

12.7 mm DShK 1938/46 heavy machine gun (500 rounds)[6]

14.5 mm KPVT heavy machine gun
(500 rounds)[6]

Secondary armament

2 × 7.62 mm PKT, SGMB or PKB tank/medium/general-purpose machine guns (3,000 rounds) mounted on the sides of the troop compartment (optional)[6]

7.62 mm PKT coaxial tank machine gun (3,000 rounds)[6]

Power-to-weight ratio
hp/tonne
(kW/tonne)

18.4
(13.7)

17.6
(13.1)

17.5
(13.0)

?

17.5
(13.0)

Analyze the provided table and identify the locations of these cells:
CELL VALUE 1: '7.62 mm PKT coaxial tank machine gun (3,000 rounds)',
CELL VALUE 2: 'BTR-60PA',
CELL VALUE 3: '17.6 (13.1)',
CELL VALUE 4: 'Primary armament',
Provide the cell locations using the JSON format {'value': '<cell value>', 'location': (row_id, column_id)}, where row and column id start from 1. Use 'DOES NOT EXIST' as the location for a non-existing cell in the table.

The target cell locations are as follows:
CELL LOCATION 1: {'value': '7.62 mm PKT coaxial tank machine gun (3,000 rounds)', 'location': (6, 3)}
CELL LOCATION 2: {'value': 'BTR-60PA', 'location': (1, 4)}
CELL LOCATION 3: {'value': '17.6 (13.1)', 'location': (7, 3)}
CELL LOCATION 4: {'value': 'Primary armament', 'location': (5, 1)}