Table:
undergraduate degree
graduate degree

unadjusted gap
adjusted gap
unadjusted gap
adjusted gap

model a
model b
model a
model b

percent

cohort

2006
-1.9
-1.8
-0.6
-5.8
-3.7
1.7

2007
-0.5
0.6
0.7
-15.8
-13.1
-8.2

2008
..
..
..
..
..
..

2009
-7.6
-7.3
-7.8
-9.8
-8.1
-9.4

2010
-7.7
-7.2
-10.0
-13.6
-9.8
-8.4

2011
-10.1
-8.5
-11.1
-3.2
2.1
0.5

Your task:
Look at the table image, determine the locations of the following cells. A cell's location MUST be represented as a json structure {'value': '<cell value>', 'location': (row number, column number)}, with row and column number beginning from 1. Denote the location as 'DOES NOT EXIST' if a cell does not exist in the table.
Target cells:
(1) '-7.7';
(2) '2006';
(3) '-0.5';
(4) '-1.8';

The target cell locations are as follows:
(1) {'value': '-7.7', 'location': (10, 2)}
(2) {'value': '2006', 'location': (6, 1)}
(3) {'value': '-0.5', 'location': (7, 2)}
(4) {'value': '-1.8', 'location': (6, 3)}