In Questions fiLl in the Blanks $\text { The Euler formula for planar connected graphs states that }$

Q22: either give an example or prove that

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Q31: refer to a cubic graph, i.e., a

Q33: for each graph give an ordered

Q35: How many different channels are needed

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Q39: In questions fill in the blanks.1113:1156<br>-

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Q62: either give an example or prove that

Q84: either give an example or prove that