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if ($arResult["UF_TITLE"]){
    $field_title = $arResult["UF_TITLE"];
    $custom_seo_title = $field_title;
    $APPLICATION->SetPageProperty('title', $custom_seo_title);
}
if ($arResult["UF_DESCRIP"]){
    $custom_seo_descrip = $arResult["UF_DESCRIP"];
    $APPLICATION->SetPageProperty('description', $custom_seo_descrip); 
}