text: function isMAC48Address(n) {
    const num = n.split('-');
    let neg = true;
    for (let i = 0; i < num.length; i++) {
      const sub = num[i].split('');
      for (let j = 0; j < sub.length; j++) {
        if (!((sub[j].charCodeAt() >= 48 && sub[j].charCodeAt() <= 57)
        || (sub[j].charCodeAt() >= 65 && sub[j].charCodeAt() <= 70))) {
          neg = false;
        }
      }
    }
    return num.length === 6 && neg;
  }
  module.exports = isMAC48Address;
  