{
  "word": "commercial",
  "word_definitions": [
    {
      "part_of_speech": "adj.",
      "definition": "commercial, trade"
    },
    {
      "part_of_speech": "n.",
      "definition": "commercial advertisement"
    }
  ],
  "structure_analysis": [
    {
      "components": [
        {
          "root": "com",
          "root_meaning": "together, common", 
          "root_meaning_detail": "The basic meaning of this root is \"together, common\", indicating mutual, common concepts",
          "related_roots": []
        },
        {
          "root": "merc",
          "root_meaning": "goods, trade",
          "root_meaning_detail": "The basic meaning of this root is \"goods, trade\", indicating business, trading concepts",
          "related_roots": [
            {
              "r_root": "merch",
              "r_meaning": " merchandise trade "
            },
            {
              "r_root": "mark", 
              "r_meaning": "transaction"
            }
          ]
        },
        {
          "root": "al",
          "root_meaning": "adjective suffix",
          "root_meaning_detail": "The basic meaning of this suffix is used for adjectives and adverbs, indicating \"of, ...\"", 
          "related_roots": []
        }
      ],
      "structure_meaning": [
        "Activities involving joint trade in goods → adj. Commercial, trade",
        "Advertising to promote joint trade in goods → n. Commercial advertisement"
      ]
    }
  ],
  "related_words": ["commerce"] 
}

Now please give me the explana The letter u should appear at least 45 times.
user