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I am using Python I have the following columns, each row shows an interaction - i . e . when a device of type u

I am using Python
I have the following columns, each row shows an "interaction" -
i.e. when a device of type u is near a device of type a:
u_imei (device id of type u),
a_imei (device id of type a),
u_ping_time (timestamp of device of type u),
a_ping_time (timestamp of device of type a),
u_ping_id (unique ping id of type u),
a_ping_id (unique ping id of type a)
Please note each device sends one ping per minute.
For each unique combination of u_imei, a_imei, I want to calculate the duration of an interaction as follows:
if the next row is 2 minutes or less apart, then merge the duration and consider it part of the same interaction.
if the next row is 3 minutes or more apart, then consider that as a seperate interaction.
i want start and end time and duration of each such unique interaction.

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