{H,T}\{\mathrm{H}, \mathrm{T}\}{H,T}
{HHH,TTT}\{\mathrm{HHH}, \mathrm{TTT}\}{HHH,TTT}
{HH,TH,HT,TT}\{\mathrm{HH}, \mathrm{TH}, \mathrm{HT}, \mathrm{TT}\}{HH,TH,HT,TT}
{HH,TT}\{\mathrm{HH}, \mathrm{TT}\}{HH,TT}