The law stipulates a SOPs be used. The SOPs has serial # which is difficult to rig and easy to trace. These SOPs were used and signed of at the polling station by all required personnel . Someone generate s spreadsheet and start inputting numbers.
The spreedsheet that was invented was showing more votes than voters in 17 of 23 boxes, and this spreedsheet show APNU has 100 more votes compare to the signed SOPs. Even the observers object to this invented spreadsheet.
there is a article on this issue, i will try to find and posted here.