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Firstly, light will run from lamp no.1 to lamp no.4 sequentially and then backwards. Thirdly, flashing light will run in turns between lamp no.1 and no.3 and lamp no.2 & no.4. Fourthly, light will run from lamp no.1 to lamp no.4 sequentially and then backwards.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.