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https://tex.stackexchange.com/questions/488/blackboard-bold-characters
https://www.overleaf.com/learn/latex/Mathematical_fonts
https://en.wikipedia.org/wiki/Blackboard_bold
https://www.cs.odu.edu/~zeil/cs390/latest/Public/texmath/index.html
http://www.cs.technion.ac.il/~yogi/Courses/CS-Scientific-Writing/examples/bbbold/bbbold.tex
http://mirror.las.iastate.edu/tex-archive/fonts/bbold/bbold.pdf
https://www.mathworks.com/matlabcentral/answers/24790-latex-interpreter-and-blackboard-bold-mathbb-for-text
http://latexref.xyz/Blackboard-bold.html
https://subscription.packtpub.com/book/hardware_and_creative/9781784395148/3/ch03lvl1sec36/writing-double-stroke-letters-as-if-on-a-blackboard
http://www.texfaq.org/FAQ-numbersets
https://www.officetooltips.com/word_2016/tips/how_to_quickly_insert_double_strike_or_blackboard_bold_symbols_in_word_equations.html
https://oeis.org/wiki/Blackboard_bold