BM 6 ( ( Ht H H t t t t Ht t HH H t t H t H tH H t H tt H tH t HtH t HtH t tt H tH H H t H t H tH H t t Ht t tH HH H Ht t Ht Ht H t t t tt H t H HH t tt H t H HH t tt t t Ht t t t t t HH HH HH t Ht H HH t t t t tH t Ht Ht t HH HH tt t Ht H HH Ht Ht ttH t t Ht H Ht tt t H t t t Ht tt t t t t t t t H tt tt t t t t H