LAlt::LCtrl
LControl & RAlt::Alt

KeyPress event, serial 36, synthetic NO, window 0x1400001,
    root 0x15a, subw 0x0, time 2274037, (436,185), root:(437,636),
    state 0x0, keycod*emphasized text*e 64 (keysym 0xffe9, Alt_L), same_screen YES,
    XLookupString gives 0 bytes:
    XmbLookupString gives 0 bytes:
    XFilterEvent returns: False

xmodmap -e "keycode 64 = Control_L"