to apply (paint etc) / to smear / to daub / to blot out / to scribble / to scrawl / (literary) mud / street
涂
=
余
+
氵
:
Someone smeared (涂) a graffiti on Tommy Turtle's (tu) sedan chair (余) just inside the space station's entrance (Ø2). Tommy Turtle tries to clean it using a bottle of water (氵).
油
=
氵
+
由
:
Maud Younger (y) is creating art in the outhouse's kitchen (ou2). She is painting a picture using oil (油) paint and occasionally using water color stored in a water bottle (氵). She is nipping a cuba libre (由) and from time to time even using her drink as color for her picture.
于
=
亅
+
二
:
Mnemonic symbol: prepositions are what glue the sentence together. Honey is as sticky as glue, so I'll represent 于 by a honey jar.
Yu the Great was assigned to repair the electrics of the space station's entrance, but instead she was snacking some honey from a honey jar. Now her capacitor got stuck in the honey and she has to use a crowbar to lever it out.
(of time or place) in; at; on / (indicating any indirect relation) to; toward; vis-à-vis; with regard to; for / (indicating a source) from; out of / (used in comparison) than / (used in the passive voice) by