User blog comment:Nayuta Ito/Brainfuck challenge/@comment-5529393-20160812103740

B(68) >= 2^^^^4 - 2 +++[>+[>+[>+[>+[>++<-]>[<+>-]<<-]>[<+>-]<<-]>[<+>-]<<-]>[<+>-]<<-]>.

B(82) >= 2^^^^^4 - 2 +++[>+[>+[>+[>+[>+[>++<-]>[<+>-]<<-]>[<+>-]<<-]>[<+>-]<<-]>[<+>-]<<-]>[<+>-]<<-]>.

B(96) >= 2^^^^^^4 - 2 +++[>+[>+[>+[>+[>+[>+[>++<-]>[<+>-]<<-]>[<+>-]<<-]>[<+>-]<<-]>[<+>-]<<-]>[<+>-]<<-]>[<+>-]<<-]>.