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$ ruby example_address_book.rb
[#<Group:0xddf24 @desc="my family", @name="family">,
#<Group:0xddf10 @desc="my friends", @name="friend">,
#<Group:0xdde84
@desc="those who works together",
@name="business">]
[#<Person:0xdefdc
@birth=#<Date: 2000-01-01 ((2451545j,0s,0n),+0s,2299161j)>,
@blood="A",
@deleted=false,
@desc=nil,
@email=nil,
@group="family",
@name="Sumire",
@phone=nil>,
#<Person:0xdee9c
@birth=#<Date: 1995-01-01 ((2449719j,0s,0n),+0s,2299161j)>,
@blood=nil,
@deleted=false,
@desc=nil,
@email="shiina@mail.org",
@group="friend",
@name="Shiina",
@phone=nil>,
#<Person:0xde8e8
@birth=nil,
@blood=nil,
@deleted=false,
@desc=nil,
@email="cherry@mail.net",
@group="business",
@name="Sakura",
@phone="012-345-6789">]
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