RichTestOrg_en_tn/amo/07/07.md

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2017-06-21 20:50:04 +00:00
# plumb line
2016-02-23 02:42:46 +00:00
2017-06-21 20:50:04 +00:00
thin rope with a weight at one end used in building to make sure walls stand straight up and down