Double Consonants
HL
hlua(rope)
credit:
www.mathsyear2000.org/thesum/ issue8/page2.html
CH
DH
DL
HL
HM
HN
KH
ML
NC
NK
NP
NQ
NR
NT
NY
PH
PL
QH
RH
TH
TS
TX
XY