single
returns single candidate CMatterImpl.
its name is material's name. material.name.
// below 2 matters are same
val matter = CMatterImpl.single(Material.STONE)
val matter = CMatterImpl(
name = "STONE",
candidate = setOf(Material.STONE),
amount = 1,
mass = false,
predicates = null
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Parameters
material
a candidate of this matter.