Table:
text: PHQ card
The early issues
The early issues
Stamp_issue_date Stamp_set _cards Card_set_ref Qty_Issued_
23 April 1975 European Architectural Year three PHQ 10 51000
11 June 1975 Sailing one PHQ 11 41350
13 August 1975 150th Anniversary of Public Railways four PHQ 12 47500
22 October 1975 Jane Austen Bicentenary four PHQ 13 27330
28 April 1976 Social Reformers one PHQ 14 38350
2 June 1976 American Bicentenary one PHQ 15 60950
30 June 1976 Roses four PHQ 16 34250

Question: Among the PHQ cards, which stamp set only had three cards?