I was classically trained to add `TK` meaning “to come” (sic.) as a placeholder. Allegedly the letter combo TK very rarely occurs otherwise. Wikipedia article

I was classically trained to add `TK` meaning “to come” (sic.) as a placeholder. Allegedly the letter combo TK very rarely occurs otherwise. Wikipedia article — https://en.m.wikipedia.org/wiki/To_come_(publishing) https://en.m.wikipedia.org/wiki/To_come_(publishing)