11-1----11--111-11----1-1--1-1---1111--11-1-----1--111-11--1-111-
11--1-11--1-----1-1---1111111-11--11-1111111---1-1-----1--11-1--1
11-111-1--111--1111111---1--1-1----1-1--1---1111111--111--1-111-1
1-1--11-11-1-111---111111--1-1-1111-1-1--111111---111-1-11-11--1-