| 1 | A | B | C | D | E | F |
| --- | --- | --- | --- | --- | --- | --- |
| 2 | Loona (group) - Singles |  |  |  |  |  |
| 3 | Title | Year | Peak chart positions | Peak chart positions | Sales | Album |
| 4 | Title | Year | KOR | US World | Sales | Album |
| 5 | "Favorite" | 2018 | — | 4 | N/A | [+ +] |
| 6 | "Hi High" | 2018 | — | 11 | N/A | [+ +] |
| 7 | "Butterfly" | 2019 | — | 6 | US: 1,000 | [× ×] |
| 8 | "—" denotes releases that did not chart. | "—" denotes releases that did not chart. | "—" denotes releases that did not chart. | "—" denotes releases that did not chart. | "—" denotes releases that did not chart. | "—" denotes releases that did not chart. |

Question: When and under which Loona albums were the singles "Hi High" and "Butterfly" released, respectively?
Answer: [+ +] was released in 2018 alongside the second single, "Hi High" and [X X] in 2019 with single, "Butterfly".