A fourth embodiment may be directed to an apparatus including at least one processor and at least one memory comprising computer program code. The at least one memory and computer program code may be configured, with the at least one processor, to cause the apparatus at least to perform the method according to the first embodiment, the second embodiment, or the third embodiment, or any of the variants discussed above.

A fifth embodiment may be directed to an apparatus that may include circuitry configured to cause the apparatus to perform the method according to the first embodiment, the second embodiment, or the third embodiment, or any of the variants discussed above.

A sixth embodiment may be directed to an apparatus that may include means for performing the method according to the first embodiment, the second embodiment, or the third embodiment, or any of the variants discussed above. Examples of the means may include one or more processors, memory, and/or computer program codes for causing the performance of the operation.

A seventh embodiment may be directed to a computer readable medium comprising program instructions stored thereon for causing an apparatus to perform at least the method according to the first embodiment, the second embodiment, or the third embodiment, or any of the variants discussed above.

An eighth embodiment may be directed to a computer program product encoding instructions for causing an apparatus to perform at least the method according to the first embodiment, the second embodiment, or the third embodiment, or any of the variants discussed above.