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class Student < ActiveRecord::Base

    def initialize ( stu_num, name, department )       initialize       end   end   s1 = Student.new s1. stu_num = "00000001" s1.name = "first" s1.department = "computer" s1.save Student.new do | s2|   s2.stu_num = "00000002"   s2.name = "two"   s2.department = "home"   s2.save end    s3 = Student.new(   :stu_num => "000000003",   :name => "three",   :department => "town"  )  s3.save    s4 = Student.create(   :stu_num => "000000004",   :name => "four",   :department => "country"  )    s5 = Student.create( [{   :stu_num => "000000005",   :name => "five",   :department => "china" },{    :stu_num => "000000006",   :name => "six",   :department => "English" } ])  

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