Simple list question

• To: mathgroup at smc.vnet.net
• Subject: [mg132585] Simple list question
• From: "Ste[hen Gray" <stevebg at roadrunner.com>
• Date: Mon, 14 Apr 2014 05:28:10 -0400 (EDT)
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```pcin = 2;
pcex = 3;   (*pcin and pcex can have various small values *)

coin = Table[{10 RandomReal[], 10 RandomReal[]}, {pcin}]
coex = Table[{3 RandomReal[], 3 RandomReal[]}, {pcex}]
cobo = Append[coin, coex]

gives, typically,

{{0.288346, 3.57763}, {1.7335, 8.69666}}
{{0.179831, 1.35324}, {0.927483, 0.931586}, {1.76338, 2.45073}}
{{0.288346, 3.57763}, {1.7335,
8.69666}, {{0.179831, 1.35324}, {0.927483, 0.931586}, {1.76338,
2.45073}}}

What I want is a series of x,y coordinates with no extra nesting:

{{0.288346, 3.57763}, {1.7335,
8.69666}, {0.179831, 1.35324}, {0.927483, 0.931586}, {1.76338,
2.45073}}

I'm embarrassed to admit that I can't find how to do this.