加拿大的手机号码可能是世界上最短的：使用7位数字。
Canada's mobile phone numbers are perhaps the world's shortest: they use seven digits.
如何把信用卡号码位数为单独的块进一步识别？
How to split credit card number digits into separate blocks for further recognition?
再加上十位数的电话号码(包括电话区号)，还有代表家庭住址和邮政区号的八位数。
A ten number telephone including the area code, home address and zip code, eight Numbers.
登入密码：请输入您的社会安全号码(税号)最后4位数字。
Password: Enter the last 4 digits of the Social Security number or Tax I. d.
登入密码：请输入您的社会安全号码(税号)最后4位数字。
Password: Enter the last 4 digits of the Social Security number or Tax I. d.
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