On failure, prints "No N-colouring exists" to stderr and exits with code 1.
With the bright versions being:
。safew官方版本下载对此有专业解读
Sign up for our Future Earth newsletter to keep up with the latest climate and environment stories with the BBC's Justin Rowlatt. Outside the UK? Sign up to our international newsletter here.
Graham Coulson has been involved for 60 years with the musical company that will celebrate its centenary in 2027.