A digital device processes electronic signals that represent either a$\_1$ or a $\_2\_.1$: one $("$on$")$ and $2$: two $("$off$")1$: one $("$on$")$ and $2$: zero $("$off$")1$: ten $("$on$")$ and $2$: zero $("$off$")1$: one $("$on$")$ and $2$: eight $("$off$")$