Question
Extend the following number pattern:
$3 8 13$ _______ _______ ______ ______ ______
$3 8 13$ _______ _______ ______ ______ ______
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| Lighter than a notebook | Heavier than a notebook |
| $(a)$ | $(a)$ |
| $(b)$ | $(b)$ |
| $(c)$ | $(c)$ |
| $(d)$ | $(d)$ |