why is it that:

>> class Akill
>>   def astop(seq)
>>    self.select{|astop| astop.first==seq}.collect
>>   end
>> end
=> nil
>> grr.astop(b[0])
i get this error....
NoMethodError: private method `select' called for #<Akill:0x2dd01f8>
        from (irb):86:in `astop'
        from (irb):89
        from ?:0
>>
...and when i do this:

class Akill
  def astop(seq)
   @arte.select{|astop| astop.first==seq}.collect
  end
end

i don't....?

...and what is the difference in it's use if both worked...
i mean...what is the difference between making a method
that uses 'self' and one that uses a instance variable....

when would one to want to design a method with self and/or with a 
instance variable?

....and even though i add to the Akill class:

  attr_reader :arte, :stops, :rtes

  ...i still get these errors....

>> class Akill
>>   def astop(seq)
>>    self.select{|astop| astop.first==seq}.collect
>>   end
>> end
=> nil
>> grr.arte.astop(b[0])
NoMethodError: undefined method `astop' for #<Array:0x2dd01b0>
        from (irb):143
        from :0
>> grr.astop([b0])
NameError: undefined local variable or method `b0' for main:Object
        from (irb):144
        from :0
>> grr.astop(b[0])
NoMethodError: private method `select' called for #<Akill:0x2dd01f8>
        from (irb):140:in `astop'
        from (irb):145
        from :0
>>

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