The Equal to or less than operator applies to attributes that can be ordered. It is used to select those contacts for which the relevant attribute has a value equal to or less than the one entered in the condition input field.
Setting the Number of children condition to Equal to or less than, with 3 as the input field value, selects all contacts with 0, 1, 2 or 3 children, but does not select those with 4 or more children.
See Input field types for more about each input field.
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