Only 3217
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Only 3228
[ajax_load_more post_type=”trips” meta_key=”areas” meta_value=”3228″ meta_compare=”LIKE” meta_relation=”OR”]

Both 3217 and 3228
[ajax_load_more post_type=”trips” meta_key=”areas” meta_value=”3217, 3228″ meta_compare=”LIKE” meta_relation=”OR”]