Removes duplicate strings from the beginning of variant titles (Shopify)

remove duplicate strings from variant titles

{% assign string = product.variants[0].title | downcase | split:' ' %}
{% assign size = string | size %}
{% assign pass = true %}
{% for i in (0..size) %}
  {% for variant in product.variants %}
    {% assign compare = variant.title | downcase | split:' ' %}
    {% unless string[i] == compare[i] %}{% assign pass = false %}{% endunless %}
  {% endfor %}
  {% if pass %}{% assign remove = remove | append:string[i] | append:' ' %}{% endif %}
{% endfor %}

<select name="id" class="product-select">
  {% for variant in product.variants %}
    <option value="{{ variant.id }}">{{ variant.title | downcase | remove:remove }}</option>
  {% endfor %}
</select>