Calligrapher Xu Keda

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Small problem:

(3 points) d

Small problem:

(3 points _)C

Small problem:

(3 points) Item A has no cause and effect before and after, Item B can only be "insightful and knowledgeable" after learning from famous teachers, and Item C is not a summary of oneself, but is used by future generations to evaluate Mr.)?

Small problem:

(3 points _) Item A is the truest, Item B is the strongest and Item D is the purest)