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a program will ONLY accept strings based on the following grammar:
<compute> --> <value> = <expression>
<value> --> X | Y | Z
<expression> --> <value> + <expression>
| <value> - <expression>
| <value>
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<compute> --> <value> = <expression>
 
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def change_str(num)
str = num.to_s
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module RubyAMF
module Configuration
#set the service path used in all requests
# RubyAMF::App::RequestStore.service_p ......
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