\(Key \,\,of\,\, C\)
\(C\,\, (I,\,\,1st\,\, inv.):\,\,G,\,\,\underline{C},\,\,E\)
\(\longrightarrow\)
\(A\,\, m\,\, (iv,\,\,root\,\, inv.):\,\,\underline{A},\,\,C,\,\,E\)
\(Key\,\,of\,\,C\,\,\sharp\)
\(C\,\,\sharp\,\,(I,\,\, 1st\,\,inv.):\,\,G\,\,\sharp,\,\,\underline{C\,\,\sharp},\,\,F\)
\(\longrightarrow\)
\(A\,\,\sharp\,\,m\,\,(iv,\,\,root \,\,inv.):\,\,\underline{A\,\,\sharp},\,\,C\,\,\sharp,\,\,F\)