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While using a simple substitution cypher, the cipher text reads as follows : sptjqzmvsjp acelqsvd sa...

  1. While using a simple substitution cypher, the cipher text reads as follows :

sptjqzmvsjp acelqsvd sa m rjv jt tlp

The key for the substitution cipher is mbeycthwskirzpjuoqavlngxdf

Using this, decode the plaintext.

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