Use RED Color marker to highlight the subject you want to memorize.
Use GREEN Color sheet to cover the highlighted subject which will make them
   disappear for memorzing.
Repeat abover steps when necessary.
Use ERASER end to erase.
ES0200: L147.2 10.5            Packing: 12/144/1152/12.6kgs/1.6'
ES0203: L160 40                   Packing: 24/36/11.6/16kgs/3.1''