@@sumisumi1659the first could be arguable but the second one is definitely sana. if you compare the end of the note to sana’s “valentine” in the bridge you will hear how similar they sound
3:16 is definitely mina because sana head voice have different placement tha mina, idk about the 3:19 sometimes sana and mina can sound very similar because mina sometimes do some stylistic choices that sound like sana