def giving(self):
logging.debug('<STR_LIT>'.format(self._give))<EOL>c = Counter(self._give.copy())<EOL>return [(n, t) for t, n in c.items()]<EOL>
Returns tuples corresponding to the number and type of each
resource in the trade from giver->getter

:return: eg [(2, Terrain.wood), (1, Terrain.brick)]