Print DNA JS Fundamentals

function dnaHelix(number) {
    let sequence = "ATCGTTAGGG";
    let counter = 0;
    for (let i = 0; i < number; i++) {
      let firstSymbol = sequence[counter % 10];
      let secondSymbol = sequence[(counter + 1) % 10];
      let row = "";

      if (i % 4 === 0) {
        row = `**${firstSymbol}${secondSymbol}**`;
      } else if (i % 4 === 1) {
        row = ` *${firstSymbol}--${secondSymbol}* `;
      } else if (i % 4 === 2) {
        row = `  ${firstSymbol}----${secondSymbol}`;
      } else if (i % 4 === 3) {
        row = ` *${firstSymbol}--${secondSymbol}* `;
      }

      console.log(row);
      counter += 2;
    }
  }