Multiple Variable Substitution In Set

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Hi All I am trying to do the following:
Set(msg=Hello ${world} how ${are} you)
I see that ${world} is substituted correctly but not ${are}
Using Asterisk 13
I am injecting ${world} and ${are} within an originate action (using Asterisk-Java)
I understand one can use max 25 variables in a originate action. I am nowherenear that limit. Any ideas why?
Thanksmurthy