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Reads the contents of the local variable named s1 and pushes it to the stack. Since s1's contents can vary, this allows dynamic reading of variables.

# Store a number in the variable named xyz 123 ->xyz 
# Build a string by concatenating "12" and "3". 
# The results is "123". Use that as the name of a var and read its contents. 
# The result of the read is pushed to the stack and traced. 
"12" "3" concat 
<-! trace