This file is indexed.

/usr/share/tuxmath/missions/lessons/lesson04 is in tuxmath-data 2.0.3-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Addition: Sums to 15

# Math options
play_through_list = 1
typing_practice_allowed = 0
addition_allowed = 1
subtraction_allowed = 0
multiplication_allowed = 0
division_allowed = 0
min_augend = 0
max_augend = 10
min_addend = 0
max_addend = 10
format_answer_last = 1
format_add_answer_last = 1
format_add_answer_first = 0
format_add_answer_middle = 0
max_answer = 15
save_summary = 1
repeat_wrongs = 1
copies_repeated_wrongs = 2
randomize = 1
comprehensive = 1
min_formula_nums = 2
max_formula_nums = 2
avg_list_length = 30
vary_list_length = 0

# General game options
allow_speedup = 1
use_feedback = 1
starting_comets = 2
extra_comets_per_wave = 2
max_comets = 10
use_powerup_comets = 0
speed = 1.00
max_speed = 20.00
danger_level = 0.35
danger_level_speedup = 1
danger_level_max = 0.90
city_explode_handicap = 0.00
keep_score = 1