Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series. _lfir_p_f_rsp_fir__ lfi_ |
pslilsprr pslilspsr prlilsprs pslilsprs |
pslilsprs |
p l f i r s / p l f i r s / p l f i r s / p l f i r s p s l i l s p r s |