text: 'use strict';
  
  let a = 3;
  let b = 1;
  let c = 4;
  let d = 2;
  let temp = null;
  
  // write some code
  temp = d;
  d = c;
  c = a;
  a = b;
  b = temp;
  
  
  
  // fill in the final _ to pass the assertions
  
  const isTrue1 = a === 1;
  console.assert(isTrue1, 'Test 1');
  
  const isTrue2 = b === 2;
  console.assert(isTrue2, 'Test 2');
  
  const isTrue3 = c === 3;
  console.assert(isTrue3, 'Test 3');
  
  const isTrue4 = d === 4;
  console.assert(isTrue4, 'Test 4');
  
  const isTrue5 = temp === b;
  console.assert(isTrue5, 'Test 5');
  
  