▁of ▁a ▁strong ▁grade ▁are ▁normally ▁quantity ▁ 2 ▁or ▁ 3 . ▁▁ ▁Quant ity ▁ 1 ▁includes ▁any ▁single ▁con son ant . ▁It ▁origin ates ▁from ▁Pro to - Sam ic ▁single ▁con son ants ▁in ▁the ▁weak ▁grade . ▁ ▁Quant ity ▁ 2 ▁includes ▁any ▁combination ▁of ▁con son ants ▁( including ▁two ▁of ▁the ▁same ) ▁with ▁a ▁short ▁con son ant ▁in ▁the ▁c oda ▁of ▁the ▁preceding ▁sy ll able . ▁It ▁origin ates ▁from ▁Pro to - Sam ic ▁single ▁con son ants ▁in ▁the ▁strong ▁grade , ▁as ▁well ▁as ▁combinations ▁of ▁two ▁con son ants ▁in ▁the ▁weak ▁grade . ▁ ▁Quant ity ▁ 3 ▁includes ▁any ▁combination ▁of ▁con son ants ▁( including ▁two ▁of ▁the ▁same ) ▁with ▁a ▁long ▁con son ant ▁in ▁the ▁c oda ▁of ▁the ▁preceding ▁sy ll able . ▁It ▁origin ates ▁from ▁Pro to - Sam ic ▁combinations ▁of ▁two ▁con son ants ▁in ▁the ▁strong ▁grade . ▁ ▁Through out ▁this ▁article ▁and ▁related ▁articles , ▁con son ants ▁that ▁are ▁part ▁of ▁different ▁sy ll ables ▁are ▁written ▁with ▁two ▁con son ant ▁letters ▁in ▁IP A , ▁while ▁the ▁length ening ▁of ▁con son ants ▁in ▁quantity ▁ 3 ▁is ▁indicated ▁with ▁an ▁IP A ▁length ▁mark ▁( ). ▁ ▁Not ▁all ▁con son ants ▁can ▁occur ▁in ▁every ▁quantity ▁type . ▁The ▁following ▁limitations ▁exist : ▁ ▁Single ▁ ▁is ▁restricted ▁to ▁quantity ▁ 1 , ▁and ▁does ▁not ▁alternate