Indicates that the speaker is confused or requests information to be repeated; come again?, say again?, I beg your pardon?; see also Thesaurus:say again
Indicates the speaker's commiseration.
Indicates the speaker's apology.
It is not important; do not fret; used to reassure or comfort the person to whom it is said.
Do not be concerned (about someone or something, or about doing something).
Indicates a withdrawal or retractment of a previous statement.
Let alone; much less.