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A tyre is a tire that is located in the U.K. while a tire is a tyre that is located in the U.S. And the yellow “highlighter class” is new.

Meanwhile, Thirteen’s suspenders are reminiscent of those worn (albeit briefly) by the Seventh Doctor (Sylvester McCoy), and their mustard color, as well as the colored stripes of her shirt, also call to mind Seven’s colorful sweater vest. – Outer Places

Then resume talking. A tyre is a tire that is located in the U.K. while a tire is a tyre that is located in the U.S. And the yellow “highlighter class” is a link to the reference post.