input: from typing import Set, List, Dict
  import requests
  from bs4 import BeautifulSoup
  import re
  
  def crawl(url: str) -> Dict[str, str]:
      """ Start a web crawler from a given URL, and collect content of each page it visits.
      The crawler will look for other links within a page and continue following them.
      It returns a dictionary with URLs as keys and their corresponding scraped texts as values.
      >>> crawl('http://example.com')
      {'http://example.com': 'Example Domain text here...', 'http://example.com/page1': 'Content of page 1...'}
      >>> crawl('http://testsite.com')
      {'http://testsite.com': 'Welcome to Test Site...', 'http://testsite.com/contact': 'Contact us at...'}
      """
      visited = set()
      content_dict = {}
      queue = [url] 
      
      while queue:
          curr = queue.pop(0)
          if curr in visited:
              continue
          visited.add(curr) 
          response = requests.get(curr)
          
          if response.ok:
              soup = BeautifulSoup(response.text, 'html.parser')
              # Scraping the page content here
              page_content = soup.get_text()
              content_dict[curr] = page_content
              
              # find all the links
              links = soup.find_all('a', href=re.compile('^http')) 
              
              for link in links:
                  if link['href'] not in visited:
                      queue.append(link['href'])
      
      return content_dict
output:     visited = set()
      content_dict = {}
      queue = [url] 
      
      while queue:
          curr = queue.pop(0)
          if curr in visited:
              continue
          visited.add(curr) 
          response = requests.get(curr)
          
          if response.ok:
              soup = BeautifulSoup(response.text, 'html.parser')
              # Scraping the page content here
              page_content = soup.get_text()
              content_dict[curr] = page_content
              
              # find all the links
              links = soup.find_all('a', href=re.compile('^http')) 
              
              for link in links:
                  if link['href'] not in visited:
                      queue.append(link['href'])
      
      return content_dict