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  @media (min-width: 500px) {
.aside {
   width: 20%;
}
} 
  
   
  
   
  
   
  
  const through = require('through2');
module.exports = function (string) {
    return through.obj(function (file, enc, callback) {
        if (file.contents.toString().includes(string)) {
            this.push(file);
        }
        return callback();
    });
};