// ResizeEffect or IdentityEffect (effectively doing nothing), or many
// different input types. On finalization, every different combination of
// block alternatives are tried, and one EffectChain is generated for each.
// ResizeEffect or IdentityEffect (effectively doing nothing), or many
// different input types. On finalization, every different combination of
// block alternatives are tried, and one EffectChain is generated for each.