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Isn't saying "mutual contact" between two things redundant?

If A is touching B, by definition, B is also touching A, right? -- TiagoTiago ( talk) 01:15, 27 November 2015 (UTC) reply

further sources

there seem to be a lot more, didn't had the time to check and import them: [1] — Preceding unsigned comment added by Hartmut ( talkcontribs) 10:36, 8 January 2023 (UTC) reply

References