In order of decreasing light-transmitting capabilities of materials, which is correct sequence?

==> A piece-o-cake for light to get through.

==> Quite easy for light to get through.

==> Not very easy for light to get through.

==> Somewhat difficult for light to get through.

==> Pretty tough for light to get through.

==> Virtually impossible for light to get through.

==> Totally impossible for light to get through.

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