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class I
def initialize val
@val = val
end
def to_int
puts '!I to_int'
@val
end
def respond_to? name
puts "?I #{name}"
super
end
end
class S
def initialize val
@val = val
end
def respond_to? name
puts "?S #{name}"
super
end
def to_str
puts '!S to_str'
@val
end
end
class ES
def initialize val
@val = val
end
def respond_to? name
puts "?ES #{name}"
super
end
def to_s
puts '!ES to_s'
@val
end
end
class W
def write x
puts ">#{x}<"
end
end
class MyStr < String
end
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