What is the theme of the expert in The Mulberry tree
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The white berries of the mulberry tree represent the innocence and purity of the O characters' passionate love. The decision to meet under the mulberry tree symbolizes the idea people act in mysterious ways when they are in love. The location of the mulberry tree near the ancient tomb represents the hand of fate in shaping the course of love.

Explanation:

there really is no explanation.

covert: hidden or secret

candid: truthful and straightforward

what i get from these phrases is covert means undercover or underground and that's where the flower is in april. on the other hand, may is the month where flowers start to bloom and thats the reason why candid is being used as a word to describe the blossoming period of a flower.

hope this answer you.