- keeping check book while top-up
- in a fun way? like crossword puzzle book (<-inspired by passengers on train doing the crossword section of the newspaper)
- look through my cash book/ expense notebook, photograph as well
- research oyster card/ oyster card sleeves
- research other card sleeves/ other ways to store cards
- sketch design ideas, could be obvious / boring design. Put ideas on paper so I could move on.
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