每周一次

每 = 𠂉 + 母 : Mnemonic symbol: from 每日一练, "train every day", somebody's doing some workout, e.g. push-ups.

每 = 𠂉 + 母 : Mahatma Gandhi does his daily training inside of the Eiffel Tower. He's quite advanced: He does single-handed push-ups with his supporting hand resting on a key, while Gaia sits on his back and mocks him.

周 = ⺆ + 土 + 口 : Mnemonic symbol: a hula hoop. James II of England (zh) performs in front of the outhouse (ou1): he swings a hula hoop (周), juggles three mandarins (口) and balances a small heap of dirt (土) on his head. He cheated a little bit though, because he stapled the heap of dirt to his wig with a stapler (⺆).

Maud Younger (y) forgot her keys to the space station (Ø1), all she brought outside was her flute (一). She has no choice but to crash the door with the giant flute.

次 = 冫 + 欠 : Mnemonic symbol: the cube, as in words involving 三次 relate to "cubic equations" or "cube (third power)". The King of Chu (c) pulls a popsicle (冫) out of the cube (次) in the space station's bathroom (Ø4) and leaves an IOU note (欠) on the cube.