To see whether the commuter pass function can be added to the card or not, simply check the number of notches cut in the lower right of the card (one notch means it can be added, but if there are two notches it can't).
定期券にできるカードかどうかは、カード右下の切り欠きの数でも判別できる（1個：できる、2個：できない）。