We are sure you definitely intend to, but not sure if you will succeed in achieving it. 
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Of course I believe you, Helen. Now - do /you/ believe /me/?
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We will believe you intend to, we will also be unsurprisingly amused when you fail to stay off twitter
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You'll give it your best shot. Is what i believe

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Seeing as how this is at least your second "I'm off to bed" tweet.... no
- End of conversation
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