Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Class | Part 1 | Part 2 | Part 3 | Part 4 | Verb meaning |
| --- | --- | --- | --- | --- | --- |
| 1 | reiten leihen | ritt lieh | ritten liehen | geritten geliehen | to ride to lend |
| 2a | bieten | bot | boten | geboten | to offer, to bid |
| 2b | saugen | sog | sogen | gesogen | to suck |
| 3a | binden rinnen glimmen | band rann glomm | banden rannen glommen | gebunden geronnen geglommen | to bind to run to shine, to glow |
| 3b | helfen dreschen | half drosch | halfen droschen | geholfen gedroschen | to help to thresh |
| 4 | treffen | traf | trafen | getroffen | to hit |
| 5 | geben | gab | gaben | gegeben | to give |
| 6 | graben | grub | gruben | gegraben | to dig |
| 7a | heißen | hieß | hießen | geheißen | to be called |
| 7b | laufen | lief | liefen | gelaufen | to run |
| 7c | halten | hielt | hielten | gehalten | to hold |
| 7d | schlafen | schlief | schliefen | geschlafen | to sleep |
Question:
Name the class for schliefen
Answer:
7d