a harmi biahalnak, harnak; e.g. I defy you to solve this problem = Hi thil har phi chuah hi kan zuam; e.g. He was preoccupied by family problems = A innchungkhar harnak lawng a lungchung ah a khat; e.g. Their unexpected arrival for dinner posed the problem of what to feed them = Ruah lopi i zanriah ei awk i an hung phanhnak nih hin, zeidah kan pek hna lai ti harnak a chuahter.