F-22 numbers – HELP!

“The F-22 program is a 187 aircraft procurement profile. (Note: 187 total includes 6 Production Representative Test Vehicle (PRTV) II aircraft, 179 production aircraft, and 2 previously procured EMD aircraft funded in RDT&E).”

Really?

Isn’t it 178 production aircraft?

01-4018 to 01-4027 (10) Block 10
02-4028 to 02-4040 (13) Block 10
03-4041 to 03-4061 (21) Block 20
04-4062 to 04-4083 (22) Block 20
05-4084 to 05-4107 (24) Block 30
06-4108 to 06-4130 (23) Block 30
07-4131 to 07-4151 (21) Block 30
08-4152 to 08-4171 (20) Block 35
09-4172 to 09-4191 (20) Block 35
10-4192 to 10-4195 (4) Block 40

10+13+21+22+24+23+21+20+20+4 = 178

And eight PRTV (Two PRTV 99-4010 to 4011 (Block IV)
Six PRTV II 00-4012 to 4017)

And nine EMD 91-4001 to 4009 (two Block I, three Block II, four Block III)

And finally two YF-22 87-0700 (N22YF), 87-0701 (N22YX).