Propose an efficient synthesis for the following transformation.

The transformation above can be performed with some reagent or

combination of the reagents listed below. Give the necessary reagent$($s$)$

in the correct order, as a string of letters $($without spaces or punctuation,

such as "EBF"$).$ If there is more than one correct solution, provi

pne answer.

A tbuok

B HBr$,$ ROOR

C EtONa

D HBr

E conc. H$2$SO$4,$ heat

F H$2$SO$4,$ H$2$O$,$ HgSO$4$

G $1.$ O$32.$ DMS

H $1.$ xsNaNH$2,2.$ H$2$O

I $1.$R$2$BH$,2.$ H$2$O$2,$ NaOH

J MeI

K HCCNa

L Br$2,$heat and light