To clarify connections you want to stress in your writing, use

To clarify connections you want to stress in your writing, use transition words (transitions). These are phrases or words the author uses to connect one idea to the next and to help the reader progress from one idea to the next. So, basically, transitions link sentences and paragraphs together smoothly.  

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the tree invited all its friends to its lumber party. the party was at saruman's tower in isengard because saruman had killed some trees