@Kym_ Here "pe sub masa" is used to indicate exactly how did he reached out his hand. Using only "sub masa" sounds a bit unnatural, or old fashioned. Using "pe" indicates how did he reach out his hand, while not using it idicates only a place. It's a fine detail, and you should be ok only understanding that "pe" is used toghether with sub "pe sub masa/pe sub casa/pe sub birou/pe sub raft"
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