Answer:
(S1) JM ≅ NL. | (R1) given.
(S2) ∠JMN ≅ ∠LNM. | (R2) given.
(S3) MN ≅ NM. | (R3) reflexive property.
(S4) ∆JMN ≅ ∆LNM | (R4) SAS theorem.
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