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 @cool-hello: "yes";
 @cool-yes: "okay";
 @var: "hello";
 
 div {
         interp1: ~"@{cool-hello}";
         interp2: ~"@{cool-@{var}}";
         interp3: ~"@{cool-@{cool-@{var}}}";
 }
 
 // interpolation in selectors
 
 @hello: 10;
 @world: "yeah";
 
 @{hello}@{world} {
         color: blue;
 }
 
 @{hello} {
         color: blue;
 }
 
 hello world @{hello} {
         color: red;
 }
 
 #@{world} {
         color: "hello @{hello}";
 }
 
 
 @num: 3;
 
 [prop],
 [prop="value@{num}"],
 [prop*="val@{num}"],
 [|prop~="val@{num}"],
 [*|prop$="val@{num}"],
 [ns|prop^="val@{num}"],
 [@{num}^="val@{num}"],
 [@{num}=@{num}],
 [@{num}] {
   attributes: yes;
 }