The difference between one letter or two letters; writing with a "SHINUI" (not the usual manner).
One letter on top of another letter.
using cards with numbers and letters; opening combination lock;
How to Soak Up a Spill on the Floor;
How to Remove Gum, Paste, or Sticky Substances; Walking with High Heels on a Dirt Ground; Removing Twigs, Pebbles, etc. with One's Foot;