Question: 2. [5 marks] A surface M is defined from an octagon (an 8-sided polygon) by identifying its boundary edges according to the code abcda1dbc1. How

2. [5 marks] A surface M is defined from an octagon (an 8-sided polygon) by identifying its boundary edges according to the code abcda1dbc1. How many distinct points of A are determined by the eight vertices? Show any working. Use your answer to write down the Euler number (M), and describe by writing down a boundary code in normal form

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