What do the ink abbreviations on the control panel stand for?

• See the following table:
  

  Abbreviation	Color
  VLM	Vivid Light Magenta
  LLK	Light Light Black
  MK	Matte Black
  LK	Light Black
  LC	Light Cyan
  C	Cyan
  VM	Vivid Magenta
  PK	Photo Black
  Y	Yellow