letter (of alphabet); character; writing
event; affair; incident; case; plot; trouble
certainly; of course; even if; no matter (who, what, when, where, why, how); without even; without so much as; at the (least, earliest, etc.)
tempering (metal); annealing; forging; toughening; disciplining; training
every day; daily; day after day; days (e.g. good old days)
to continue; to last; to continue (without a break); to be unbroken; to occur again and again; to lead to; to connect to