input: 
  from typing import List
  
  def perform_crud_operations(models: List[str]) -> List[List[str]]:
      """Perform CRUD (Create, Read, Update, Delete) operations on a list of model names.
      The function should initialize a memory-based SQLite database, create a table 
      for the models, insert each model name into the table, read all model names, 
      update each model name to "UpdatedModel", and finally delete each model.
      Return a list of lists where the first list is the result of the read operation
      and the second list is the result of the read operation after all updates and 
      deletions.
      >>> perform_crud_operations(["Model1", "Model2"])
      [[('Model1',), ('Model2',)], []]
      >>> perform_crud_operations([])
      [[], []]
      """
      import sqlite3
  
      class Model:
          def __init__(self):
              self.conn = sqlite3.connect(":memory:")
              self.cursor = self.conn.cursor()
  
          def create(self, name):
              self.cursor.execute(
                  "CREATE TABLE IF NOT EXISTS Models (name TEXT)"
              )
              self.cursor.execute(
                  "INSERT INTO Models(name) VALUES (?)",
                  (name,),
              )
              self.conn.commit()
  
          def read(self):
              self.cursor.execute("SELECT * FROM Models")
              return self.cursor.fetchall()
  
          def update(self, name):
              self.cursor.execute(
                  "UPDATE Models SET name = ? WHERE name = ?", 
                  ("UpdatedModel", name,),
              )
              self.conn.commit()
          
          def delete(self, name):
              self.cursor.execute(
                  "DELETE FROM Models WHERE name = ?",
                  (name,),
              )
              self.conn.commit()
  
      model_instance = Model()
      first_read_result = []
      second_read_result = []
  
      for model in models:
          model_instance.create(model)
      
      first_read_result = model_instance.read()
  
      for model in models:
          model_instance.update(model)
  
      for model in models:
          model_instance.delete("UpdatedModel")
  
      second_read_result = model_instance.read()
  
      return [first_read_result, second_read_result]
  
output:     model_instance.conn.close()