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Warning sign on agricultural machinery. Read the instructions before using. Before starting maintenance and repair work, the engine must be switched off and the ignition key removed.
Balance between require and obviate. Chalkboard drawing on black chalkboard
Chalk drawing of scales with words require and obviate on black board. Concept of balance
Concept of dealing with troubles. Chalk sketch of connecting puzzles with words require and obviate.
Ploblem solving. Chalk sketch of two puzzles with words require and obviate on black chalkboard

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