In different books, I've encountered different examples:
LEAVE - leave, leaves, left, and leaving
TAKE - take, takes, took, taken and taking
BANK- the shore of a river and a particular kind of financial institution
What would we call a lexeme then? Leave, take and bank - thinking about a lexeme in terms of a 'set of grammatical words'?
Or perhaps both the 'base' words and the inflicted forms (or the meanings), which are derived from them?