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From: DJ Delorie <dj AT delorie DOT com>
To: geda-help AT delorie DOT com
Subject: Re: [geda-help] is there a bug in pcb?
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Date: Mon, 16 Jan 2017 12:04:07 -0500
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Trailing lower case letters are special cased, either end in an upper
case letter or add a digit.

Historically, lower case letter suffixes were used for selecting a gate
in a chip, like a quad NAND gate being U5a, U5b, etc.  and pcb ignores
those suffixes when searching for parts.