I gave one last night concerning countries (using the alphabet as a guide and thinking of countries that start with each letter. Considering the Dukkha that can happen for people in each country). Another way for people is to go through occupations of people. Trying to get closer to occupations; understanding what type of Dukkha might be in that type of occupation and having Compassion/Lovingkindness for people who have that occupation. Using the alphabet can help you stay focused. This helps us throughout our life when we meet people, in that we automatically feel closer to them. It makes it easier to have Compassion/Lovingkindness for people we don't know. Going through all the ages of people can be another way.