/usr/share/tesseract-ocr/tessdata/configs/box.train.stderr is in libtesseract3 3.04.01-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#tessedit_use_nn F
textord_fast_pitch_test T
tessedit_single_match 0
tessedit_zero_rejection T
tessedit_minimal_rejection F
tessedit_write_rep_codes F
il1_adaption_test 1
edges_children_fix F
edges_childarea 0.65
edges_boxarea 0.9
tessedit_resegment_from_boxes T
tessedit_train_from_boxes T
#textord_repeat_extraction F
textord_no_rejects T
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