Open Nickleaton opened 2 years ago
http://wscwpc2018.cz/wp-content/uploads/2018/10/WSC_2018_instruction_booklet_v5.pdf All pairs of adjacent digits with a sum or difference equal to five are marked with a small circle.
http://wscwpc2018.cz/wp-content/uploads/2018/10/WSC_2018_instruction_booklet_v5.pdf All pairs of adjacent digits with a sum or difference equal to five are marked with a small circle.