hello, i predict the meaning of the responses mostly but i do not understand what is those 2?

rank_hhc_p15_ft: ?
rank_ahc_p15_ft: ?

rank_htw_ft: home team win full time
rank_drw_ft: draw full time
rank_atw_ft: away team win full time
rank_to_05_ft: total over 0,5 full time
rank_to_15_ft: total over 1,5 full time
rank_to_25_ft: total over 2,5 full time
rank_to_35_ft: total over 3,5 full time
rank_btts_ft: both team score full time
rank_ho_05_ft: home over 0,5 full time
rank_ho_15_ft: home over 1,5 full time
rank_ao_05_ft: away over 0,5 full time
rank_ao_15_ft: away over 1,5 full time
rank_htw_ht: home team win half time
rank_drw_ht: draw half time
rank_atw_ht: away team win half time
rank_to_05_ht: total over 0,5 half time
rank_to_15_ht: total over 1,5 half time
rank_to_25_ht: total over 2,5 half time
rank_btts_ht: both team score half time
rank_ho_05_ht: home over 0,5 half time
rank_ho_15_ht: home over 1,5 half time
rank_ao_05_ht: away over 0,5 half time
rank_ao_15_ht: away over 1,5 half time