S1. 2↑3↑(2+1=3)∗2∗ (3+2=5) (+ having high precednce)
S2. (2↑3=8)↑3*2*5 (↑ more precedence than * and also left associative(first evalute leftmost)
S3. (8↑3=512)*2*5
S4. 512*2*5=5120
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