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Comment: fix typos
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h3. I shall do one thing and one thing well
To be able to re-use a service, the service has to have a tightly defined responsibility. Just think in terms ogf building Lego-blocks. Some bricks makes for good building blocks, while other are specialized appliances.
h3. I should never fail, but if I do, I will do it gracefully
Since the service will have an undetermined number of consumers, we need to take extra care of how we fullfill out fulfill our contract and responsibility.
h3. I shall retain evolvability