press    'w'      save O-Table and V-Table to file

press    'n'      move blue dot to next corner
press    'p'      move blue dot to previous corner
press    'o'      move blue dot to opposite corner, if it exist
press    'r'      move blue dot to right corner, if it exist
press    'l'      move blue dot to left corner, if it exist

press    '>'      move blue dot along the border
press    '<'      move blue dot along the border

press BACKSPACE   To reset, return to one triangle
press   'ESC'     To exit
press    'h'      To show this help