How can I concatenate two list variables in jinja2?

E.G.

GRP1 = [1, 2, 3]
GRP2 = [4, 5, 6]

{# This works fine: #}
{% for M in GRP1 %}
    Value is {{M}}
{% endfor %}


{# But this does not: #}
{% for M in GRP1 + GRP2 %}
    Value is {{M}}
{% endfor %}

So, I have tried to concatenate the two lists using + (like you would in Python), but it turns out that they are not lists, but python xrange objects:

jijna2 error: unsupported operand type(s) for +: 'xrange' and 'xrange'

Is there a way for me to iterate over the concatenation of GRP1 and GRP2 in the same for loop?

jinja2
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