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I always say hi, and never travel with people. I want to be nice, but I want to be alone. Most other people do too. In the rare and horrifying case that someone on the trail is lonely and desperately searching for a friend (like old people in line at the grocery store) you don't want to give them much opportunity to engage with you and start a conversation, otherwise yer fukt. Smile, glance at them quickly with a quick greeting, look down and keep moving.
