Course of Raku / Essentials / Strings / Variable interpolation

Quiz: String interpolation

Select the strings, where the value of $x is interpolated exactly one time.

1 "The temperature is $x degrees"  
0 'Air pressure is $x mmHg' No interpolation in single quotes.
0 'The value of \$x is $x' No interpolation and no escaping. It prints The value of \$x is $x.
1 "The value of \$x is $x" The whole phrase gives, for example, The value of $x is 42.
0 "The value of $x is $x" $x is interpolated twice here.

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