| lmer(R~E1+(E1|ID)) |
| lmer(R~E1+E2+(E1+E2|ID)) |
| lmer(R~E1+E2+E3+(E1+E2+E3|ID)) |
| lmer(R~E1+E2+E3+E4+(E1+E2+E3+E4|ID)) |
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