Table:
text: 2006–07 in Welsh rugby union
WRU Division One East
WRU Division One East
Club Played Won Drawn Lost Points_for Points_against Tries_for Points
Caerphilly RFC 22 9 0 14 402 572 47 24
Blackwood RFC 22 6 1 15 433 511 51 19
Abercynon RFC 22 5 2 15 365 718 45 17
Ystrad Rhondda RFC 22 5 1 16 417 570 47 16

Question: What is the total number of clubs lost from 16 WRU Division One East in Welsh rugby union in 2006/07?