What is code 61 flange and code 62 flange?

ARES6162 - what is 61 62 61-62 , part 63 , part 63 , part 63 , part 63 , part 63 what is sequence number on woolworths store card 2020 Jan 24;2:61-62 Authors Wenjie Tan , Xiang Zhao

what is idfa 61 likely means y = ln, that's the only logical interpretation if it's different from 62 It's very poorly written and more