/usr/share/doc/libfreetype6/reference/ is in libfreetype6-dev 2.5.2-1ubuntu2.
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/usr/share/doc/libfreetype6/reference/ft2-auto_hinter.html
/usr/share/doc/libfreetype6/reference/ft2-base_interface.html
/usr/share/doc/libfreetype6/reference/ft2-basic_types.html
/usr/share/doc/libfreetype6/reference/ft2-bdf_fonts.html
/usr/share/doc/libfreetype6/reference/ft2-bitmap_handling.html
/usr/share/doc/libfreetype6/reference/ft2-bzip2.html
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/usr/share/doc/libfreetype6/reference/ft2-cff_driver.html
/usr/share/doc/libfreetype6/reference/ft2-cid_fonts.html
/usr/share/doc/libfreetype6/reference/ft2-computations.html
/usr/share/doc/libfreetype6/reference/ft2-font_formats.html
/usr/share/doc/libfreetype6/reference/ft2-gasp_table.html
/usr/share/doc/libfreetype6/reference/ft2-glyph_management.html
/usr/share/doc/libfreetype6/reference/ft2-glyph_stroker.html
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/usr/share/doc/libfreetype6/reference/ft2-gx_validation.html
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/usr/share/doc/libfreetype6/reference/ft2-header_file_macros.html
/usr/share/doc/libfreetype6/reference/ft2-incremental.html
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/usr/share/doc/libfreetype6/reference/ft2-module_management.html
/usr/share/doc/libfreetype6/reference/ft2-multiple_masters.html
/usr/share/doc/libfreetype6/reference/ft2-ot_validation.html
/usr/share/doc/libfreetype6/reference/ft2-outline_processing.html
/usr/share/doc/libfreetype6/reference/ft2-pfr_fonts.html
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/usr/share/doc/libfreetype6/reference/ft2-sfnt_names.html
/usr/share/doc/libfreetype6/reference/ft2-sizes_management.html
/usr/share/doc/libfreetype6/reference/ft2-system_interface.html
/usr/share/doc/libfreetype6/reference/ft2-toc.html
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/usr/share/doc/libfreetype6/reference/ft2-truetype_tables.html
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/usr/share/doc/libfreetype6/reference/ft2-type1_tables.html
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/usr/share/doc/libfreetype6/reference/ft2-version.html
/usr/share/doc/libfreetype6/reference/ft2-winfnt_fonts.html