{%- set w, h = 10, 10 -%} {%- for wi in range(w) -%} {%- endfor -%}

{%- for i in range(h - 1) -%}

{%- for wi in range(w) -%} {%- endfor -%} {%- endfor -%} {%- for i in range(h - 1) -%}

{%- endfor -%}