Joey challenges #158 and 159

Challenge 158:
String "m" by Joey and started with MI2 by Mimi Lempart
Other tangle used:
Merryweather - Sandy Hunter

Challenge 159:
String "N" by Joey and started with Natti by Anita Apfors Westin
Other tangles used:
Nulink - Ina Sonnenmoser
Neuron - Bessamy Snoderly