Question: Command completion: is there a shortcut for ":-"

I am using the tab key to complete commands. Often I have to add a module to the command. On my keyboard typing ":-" is slow (for me) and interrupts the flow. I was wondering whether there is not a undocumented key or shortcut to insert ":-".

(I tried a second time hitting tab but this did not do anything. Would this be a good way to speed up typing?)

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