十
=
一
+
丨
:
Mnemonic symbol: a holy cross. Sherlock Holmes (sh-) is investigating a very strange thing he found in the kitchen of the space station (-2): A big pyramid made of ten (十) crosses (十), which are in turn made out of flutes (一) and dinosaur bones (丨).
廿
=
卄
+
一
:
Nefertiti needs to vent off steam. In anthill's bathroom she finds a flower pot with twenty flutes inside. With a single swing with her double axe, she splits all twenty flutes. Afterwards, she feels much better.