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Fill in the suitable prepositions: by, in, into, for, of or on.

The Australian Aboriginal flag is one of the official flags of Australia. It was created __ 1971 __Harold Thomas, an Aboriginal artist. The flag is divided __ 2 parts. The upper stripe is black and the lower is red. The black stands __Aboriginal people and the red-__ the land. There is a yellow disc the centre __the flag. It is a symbol_______ the sun. The flag was first flown__ National Aborigines Day __12 July 1971 __Adelaide.​