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Check if an element exists in list.
contains(object, x)# S4 method for pmx_list,pmx_element contains(object, x)# S4 method for statements_record,model_statement contains(object, x)# S4 method for campsis_model,pmx_element contains(object, x)
# S4 method for pmx_list,pmx_element contains(object, x)
# S4 method for statements_record,model_statement contains(object, x)
# S4 method for campsis_model,pmx_element contains(object, x)
logical value, TRUE or FALSE
list object
element to check if exists