N p c

N p cN p cN p cN p c
N p cN p cN p cN p cN p cN p cN p cN p c
N p cN p cN p cN p cN p cN p cN p cN p cN p cN p cN p cN p c
N p cN p cN p cN p cN p cN p cN p cN p cN p cN p cN p cN p cN p cN p cN p cN p c
N p cN p cN p cN p cN p cN p cN p cN p c