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In page Miep Gies:

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When purchasing food for the people in hiding, Gies avoided suspicion in many ways: for example, by visiting several different suppliers in a day. She never carried more than what one shopping bag could hold or what she could hide under her coat. To prevent the Opekta workers from becoming suspicious, Gies tried not to enter the hiding place during office hours. Her husband also helped by providing ration cards that he had obtained illegally. By visiting various grocery shops and markets on a regular basis, Gies developed a good sense of the supply situation.[citation needed]