19732
It expects to begin construction by year end and start shipping four - megabit dynamic random - access memory chips by mid-1991 .
 date: year end; quantity: four - megabit; date: mid-1991
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
 Entities: year end, four - megabit, mid-1991 
Answer:
 date: year end; quantity: four - megabit; date: mid-1991