$n = 1 row_index = 1
$n = 2 row_index = 2
$n = 3 row_index = 3
$n = 4 row_index = 4
$n = 1 row_index = 5
$n = 2 row_index = 6
$n = 3 row_index = 7
$n = 4 row_index = 8
$n = 1 row_index = 9
$n = 2 row_index = 10
$n = 3 row_index = 11
$n = 4 row_index = 12
$n = 1 row_index = 13
$n = 2 row_index = 14
$n = 3 row_index = 15
$n = 4 row_index = 16
$n = 1 row_index = 17
$n = 2 row_index = 18
$n = 3 row_index = 19
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