1"{}" 2"{:08d}" 3"{0:d}" 4"{0:x}" 5"{0:o}" 6"{0:b}" 7"{:03.2f}" 8"{1}" 9"{0}" 10"{:<8}" 11"{:<999999999999999999999999}" 12"[%H:%M:%S %z]" 13"[%^%L%$]" 14"[thread %t]" 15"%v" 16"%+" 17"{:X}" 18"{:s}" 19"{:p}" 20"{:n}"