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The best advice I was ever given was:
1. Be Clear
2. Be Concise
3. Use Proper Spelling
4. Use Proper Grammer
5. Be Well Informed
Write "freely" and don't be afraid to be spontaneous, don't worry about rambling along, give full rein to your feelings, emotions, imagination and creativity. Once it's down on paper you have the template and can change, adjust and amend until you are happy with the result.
