This file is indexed.

/usr/share/tesseract-ocr/tessdata/configs/ambigs.train is in libtesseract-data 3.04.01-5.

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The actual contents of the file can be viewed below.

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tessedit_ambigs_training	1
load_freq_dawg	0
load_punc_dawg	0
load_system_dawg	0
load_number_dawg	0
ambigs_debug_level	3
load_fixed_length_dawgs	0